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Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: ServHelper

NamesServHelper
CategoryMalware
TypeBackdoor, Credential stealer, Downloader
DescriptionServHelper is written in Delphi and according to ProofPoint best classified as a backdoor.

ProofPoint noticed two distinct variant - 'tunnel' and 'downloader' (citation):
'The 'tunnel' variant has more features and focuses on setting up reverse SSH tunnels to allow the threat actor to access the infected host via Remote Desktop Protocol (RDP). Once ServHelper establishes remote desktop access, the malware contains functionality for the threat actor to 'hijack' legitimate user accounts or their web browser profiles and use them as they see fit. The 'downloader' variant is stripped of the tunneling and hijacking functionality and is used as a basic downloader.'
Information<https://www.proofpoint.com/us/threat-insight/post/servhelper-and-flawedgrace-new-malware-introduced-ta505>
<https://e.cyberint.com/hubfs/Report%20Legit%20Remote%20Access%20Tools%20Turn%20Into%20Threat%20Actors%20Tools/CyberInt_Legit%20Remote%20Access%20Tools%20Turn%20Into%20Threat%20Actors'%20Tools_Report.pdf>
<https://www.deepinstinct.com/2019/04/02/new-servhelper-variant-employs-excel-4-0-macro-to-drop-signed-payload/>
<https://ti.360.net/blog/articles/excel-4.0-macro-utilized-by-ta505-to-target-financial-institutions-recently-en/>
<https://www.cybereason.com/blog/threat-actor-ta505-targets-financial-enterprises-using-lolbins-and-a-new-backdoor-malware>
MITRE ATT&CK<https://attack.mitre.org/software/S0382/>
Malpedia<https://malpedia.caad.fkie.fraunhofer.de/details/win.servhelper>

Last change to this tool card: 14 May 2020

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All groups using tool ServHelper

ChangedNameCountryObserved

APT groups

 TA505, Graceful Spider, Gold EvergreenRussia2006-Oct 2020X

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

Thailand Computer Emergency Response Team (ThaiCERT)
Electronic Transactions Development Agency

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