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Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: PyFlash

Description(ESET) This second stage backdoor is a py2exe executable. py2exe is a Python extension to convert a Python script into a standalone Windows executable. To our knowledge, this is the first time the Turla developers have used the Python language in a backdoor.

The backdoor communicates with its hardcoded C&C server via HTTP. The C&C URL and other parameters such as the AES key and IV used to encrypt all network communications are specified at the beginning of the script.

The C&C server can also send backdoor commands in JSON format. The commands implemented in this version of PyFlash are:
• Download additional files from a given HTTP(S) link.
• Execute a Windows command using the Python function subprocess32.Popen.
• Change the execution delay: modifies the Windows task that regularly (every X minutes; 5 by default) launches the malware.
• Kill (uninstall) the malware.
AlienVault OTX<>

Last change to this tool card: 20 April 2020

Download this tool card in JSON format

All groups using tool PyFlash


APT groups

XTurla, Waterbug, Venomous BearRussia1996-May 2022 HOT 

1 group listed (1 APT, 0 other, 0 unknown)

Digital Service Security Center
Electronic Transactions Development Agency

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