Today, Talos is publishing a glimpse into the most prevalent threats we've observed between June 11 and June 17. As with previous roundups, this post isn't meant to be an in-depth analysis. Instead, this post will summarize the threats we've observed by highlighting key behavioral characteristics, indicators of compromise, and discussing how our customers are automatically protected from these threats.
As a reminder, the information provided for the following threats in this post is non-exhaustive and current as of the date of publication. Additionally, please keep in mind that IOC searching is only one part of threat hunting. Spotting a single IOC does not necessarily indicate maliciousness. Detection and coverage for the following threats is subject to updates, pending additional threat or vulnerability analysis. For the most current information, please refer to your Firepower Management Center, Snort.org, or ClamAV.net.
For each threat described below, this blog post only lists 25 of the associated file hashes and up to 25 IOCs for each category. An accompanying JSON file can be found here that includes the complete list of file hashes, as well as all other IOCs from this post. A visual depiction of the MITRE ATT&CK techniques associated with each threat is also shown. In these images, the brightness of the technique indicates how prevalent it is across all threat files where dynamic analysis was conducted. There are five distinct shades that are used, with the darkest indicating that no files exhibited technique behavior and the brightest indicating that technique behavior was observed from 75 percent or more of the files.
The most prevalent threats highlighted in this roundup are:
Remcos is a remote access trojan (RAT) that allows attackers to execute commands on the infected host, log keystrokes, interact with a webcam and capture screenshots. This malware is commonly delivered through Microsoft Office documents with macros, sent as attachments on malicious emails.
TinyBanker, also known as Zusy or Tinba, is a trojan that uses man-in-the-middle attacks to steal banking information. When executed, it injects itself into legitimate Windows processes such as "explorer.exe" and "winver.exe." When the user accesses a banking website, it displays a form to trick the user into submitting personal information.
This malware installs and executes cryptocurrency mining software. You can read more about this kind of threat on our blog /blocking-cryptomining.
Dridex is a well-known banking trojan that steals credentials and other sensitive information from an infected machine.
Adrozek is a family of malware that hooks into installed web browsers to inject malicious ads onto webpages and that can also steal login credentials to websites that a user visits.
Razy is oftentimes a generic detection name for a Windows trojan. It collects sensitive information from the infected host and encrypts the data, eventually sending it to a command and control (C2) server. Information collected may include screenshots. The samples modify auto-execute functionality by setting and creating a value in the registry for persistence.
DarkComet and related variants are a family of remote access trojans designed to provide an attacker with control over an infected system. This malware has the ability to download files from a user's machine, mechanisms for persistence and hiding, and the ability to send back usernames and passwords from the infected system.
Upatre is a malicious downloader often used by exploit kits and phishing campaigns. Upatre downloads and executes malicious executables, such as banking malware.
Gh0stRAT is a well-known family of trojans designed to provide an attacker with complete control over an infected system. Its capabilities include monitoring keystrokes, collecting video footage from the webcam and uploading/executing follow-on malware. The source code for Gh0stRAT has been publicly available on the internet for years, significantly lowering the barrier for actors to modify and reuse the code in new attacks.
Indicators of Compromise
IOCs collected from dynamic analysis of 10 samples
Value Name: licence
Value Name: NOME
Cisco AMP for Endpoints protects users from a variety of malware functions with exploit prevention. Exploit prevention helps users defend endpoints from memory attacks commonly used by obfuscated malware and exploits. These exploits use certain features to bypass typical anti-virus software, but were blocked by AMP thanks to its advanced scanning capabilities, even protecting against zero-day vulnerabilities.
Process hollowing detected - (12418)
Process hollowing is a technique used by some programs to avoid static analysis. In typical usage, a process is started and its obfuscated or encrypted contents are unpacked into memory. The parent then manually sets up the first stages of launching a child process, but before launching it, the memory is cleared and filled in with the memory from the parent instead.
Excessively long PowerShell command detected - (5736)
A PowerShell command with a very long command line argument that may indicate an obfuscated script has been detected. PowerShell is an extensible Windows scripting language present on all versions of Windows. Malware authors use PowerShell in an attempt to evade security software or other monitoring that is not tuned to detect PowerShell based threats.
Reverse tcp payload detected - (2106)
An exploit payload intended to connect back to an attacker controlled host using tcp has been detected.
Crystalbit-Apple DLL double hijack was detected. During this attack, the adversary abuses two legitimate vendor applications, such as CrystalBit and Apple, as part of a dll double hijack attack chain that starts with a fraudulent software bundle and eventually leads to a persistent miner and in some cases spyware deployment.
A Microsoft Office process has started a windows utility. - (810)
A process associated with Microsoft Office, such as EXCEL.exe or WINWORD.exe, has started a Windows utility such as powershell.exe or cmd.exe. This is typical behavior of malicious documents executing additional scripts. This behavior is extremely suspicious and is associated with many malware different malware campaigns and families.
Kovter injection detected - (601)
A process was injected into, most likely by an existing Kovter infection. Kovter is a click fraud Trojan that can also act as an information stealer. Kovter is also file-less malware meaning the malicious DLL is stored inside Windows registry and injected directly into memory using PowerShell. It can detect and report the usage of monitoring software such as wireshark and sandboxes to its C2. It spreads through malicious advertising and spam campaigns.
Squiblydoo application control bypass attempt detected. - (451)
An attempt to bypass application control via the "Squiblydoo" technique has been detected. This typically involves using regsvr32.exe to execute script content hosted on an attacker controlled server.
Dealply adware detected - (403)
DealPly is adware, which claims to improve your online shopping experience. It is often bundled into other legitimate installers and is difficult to uninstall. It creates pop-up advertisements and injects advertisements on webpages. Adware has also been known to download and install malware.
IcedID malware detected - (209)
IcedID is a banking Trojan. It uses both web browser injection and browser redirection to steal banking and/or other financial credentials and data. The features and sophistication of IcedID demonstrate the malware author's knowledge and technical skill for this kind of fraud, and suggest the authors have previous experience creating banking Trojans. IcedID has been observed being installed by Emotet or Ursnif. Systems infected with IcedID should also be scanned for additional
CVE-2019-0708 detected - (141)
An attempt to exploit CVE-2019-0708 has been detected. The vulnerability, dubbed BlueKeep, is a heap memory corruption which can be triggered by sending a specially crafted Remote Desktop Protocol (RDP) request. Since this vulnerability can be triggered without authentication and allows remote code execution, it can be used by worms to spread automatically without human interaction.