Rewterz Threat Advisory – Malware Controlled Through Command-containing memes on Twitter

SEVERITY: Medium

CATEGORY: Informative Updates

ANALYSIS SUMMARY

A set of commands have been retrieved from memes posted on a hacker-controlled Twitter account, containing malware controlled by hackers. The new threat is detected as (TROJAN.MSIL.BERBOMTHUM.AA), a malicious Trojan received via legitimate service of Twitter. The BERBOMTHUM malware checks the Twitter account used by the attackers, downloads and scans meme files, and extracts the commands they include.

Attackers hid the “/print” command in the memes, which allows them to take screenshots of the infected machine and send them back to a C&C server whose address is obtained through a hard-coded URL on pastebin.com. Following commands were retrieved from the memes.

Commands

/print (Screen capture)

/processos (Retrieve list of running processes)

/clip (Capture clipboard content)

/username (Retrieve username from infected machine)

/docs (Retrieve filenames from a predefined path such as (desktop, %AppData% etc.))

The malware can only be disabled by deletion of the malicious Twitter account.

IMPACT

Command execution on target device.

AFFECTED PRODUCTS

Twitter

REMEDIATION 

Do not download or click on attachments or links that are unexpected and do not seem to be coming from legitimate and verified sources.