Threat Library - Agent Tesla

 Agent Tesla

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date: 5/5/2021

delivery: Unknown

persistence: scheduled Task, \Updates\SPjSKjh, c:\users\<userid>\appdata\roaming\spjskih.exe

capabilities (per memory strings): Keylogger (KeyDown, KeyboardState, StartKeyLogger), Credential Theft (UCBrowser, Vivaldi, Thunderbird, etc.)

c2s: unknown

identification method: filname similar to previous (vbc.exe) and other patterns match like re-launch EXE after 1min45sec, smtp type c2 possible, etc.

special notes: .net executable, starts execution at about ~14 to 15mb initially, waits about 1 min 45 seconds, then relaunched itself, new pid, 2nd executable waits several minutes to do anything, then checks for credentials (chrome, qqbrowser, ultravnc, thunderbird, waterfox, etc.) through disk and registry, in memory strings on 2nd end up including the credential theft, also this has "Snake Keylogger" inside it per strings, as well as API.Telegram.org connections and possible SMTP c2 with email address

samples: 

EXE - https://www.virustotal.com/gui/file/089d065fe8e39f8b19a726cb15ac216e352a5576f446c5fc38486f1fbb7a1d9c/detection

links: 

https://twitter.com/neonprimetime/status/1389964247942279168

screenshots: 

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date: 4/29/2021

delivery: email [Subject: New PO#422328, ISO (PO#0422328.pdf.iso) w/ EXE inside (PO#04222328.pdf.exe)]

persistence: startup registry entry (hkcu\software\microsoft\currentversion\run, gqxRqe, c:\users\<userid>appdata\roaming\gqxRqe\gqxRqe.exe)

capabilities (per memory strings): Keylogger (KeyDown, KeyboardState), Credential Theft (UCBrowser, Vivaldi, Thunderbird, etc.)

c2s: unknown

identification method: strings in memory matching previously seen ( %mailaddres%%password%%smtp%%toemail% )

special notes: .net executable, link to torproject.org download in .net code, code for webrequest and smtpclient, double file extension (PO#04222328.pdf.exe), starts execution at about ~14 to 15mb initially, waits about 1 min 45 seconds, then relaunched itself, new pid, 2nd executable waits several minutes to do anything, only gets to ~17mb or 18mb, then checks for credentials (chrome, qqbrowser, ultravnc, thunderbird, waterfox, etc.) through disk and registry, in memory strings on 2nd end up including the credential theft

samples: 

ISO - https://www.virustotal.com/gui/file/f07b343d5a7b752a5b396b06174428a66ab98d8bb28bf33e9ea911797c32af2d/detection

EXE - https://www.virustotal.com/gui/file/83bcf31fc0d06b39c6cce6bc074cde9033f5e378f0104da887ec3f924f73376a/detection

links: 

https://twitter.com/neonprimetime/status/1387837559531786243

screenshots: 

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 date: 10/13/2020

delivery: email [Subject: Request for Quotation, Link to DOC (http://107.173.219[.]56/document ), downloads EXE from same domain ( http://107.173.219[.]56/tmt.exe ), runs Equation Editor exploit (EQNEDT32.EXE)]

persistence: unknown

capabilities (per memory strings): unknown

c2s: smtp.yandex[.]ru

identification method: twitter replies

special notes: child processes of "vbc.exe" and "RegAsm.exe"

samples: 

DOC - https://app.any.run/tasks/0410129a-646d-4c19-8207-081679403171/

links: 

https://twitter.com/neonprimetime/status/1316107602942668800

screenshots: 

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