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Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: logon.dll

Nameslogon.dll
CategoryMalware
TypeBackdoor
Description(Avast) Both DLLs, sqllauncher.dll and logon.dll, are primarily used as backdoors. These are installed as services by the aforementioned batch file. They both create a log file under the path: %COMMON_DOCUMENT%\WZ9JuN00.tmp aggregating errors during the backdoor’s runtime. Each entry contains an error code, an error message, and a timestamp formatted as “[yyyy-mm-dd hh-mm-ss] %error code% %message%”.

If the infected device can’t connect to the C&C server, the malware attempts to determine whether the traffic is routed through a proxy. This information may be retrieved either from %WINDOWS%\debug\netlogon.cfg or from the TCP table. After successfully connecting to the C&C server, a secure communication channel (Schannel) is established and telemetry (OS version, username) is sent to the C&C server.
Information<https://decoded.avast.io/luigicamastra/apt-group-planted-backdoors-targeting-high-profile-networks-in-central-asia/>

Last change to this tool card: 17 May 2020

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All groups using tool logon.dll

ChangedNameCountryObserved

APT groups

 MikroceenChina2017-Mar 2021 

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

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

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