win.agent_tesla (Back to overview)

Agent Tesla

Actor(s): SWEED

URLhaus              

A .NET based keylogger and RAT readily available to actors. Logs keystrokes and the host's clipboard and beacons this information back to the C2.

References
https://blog.fortinet.com/2017/06/28/in-depth-analysis-of-net-malware-javaupdtr
https://blog.talosintelligence.com/2019/07/sweed-agent-tesla.html
https://blogs.forcepoint.com/security-labs/part-two-camouflage-netting
https://malwarebreakdown.com/2018/01/11/malspam-entitled-invoice-attched-for-your-reference-delivers-agent-tesla-keylogger/
https://researchcenter.paloaltonetworks.com/2017/09/unit42-analyzing-various-layers-agentteslas-packing/
https://thisissecurity.stormshield.com/2018/01/12/agent-tesla-campaign/
https://www.fortinet.com/blog/threat-research/analysis-of-new-agent-tesla-spyware-variant.html
https://www.zscaler.com/blogs/research/agent-tesla-keylogger-delivered-using-cybersquatting
Yara Rules
[TLP:WHITE] win_agent_tesla_w0 (20190731 | No description)
rule win_agent_tesla_w0 {
    meta:
        author = "InQuest Labs"
        source = "https://www.inquest.net"
        created = "05/18/2018"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.agent_tesla"
        malpedia_version = "20190731"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $s0 = "SecretId1" ascii
        $s1 = "#GUID" ascii
        $s2 = "#Strings" ascii
        $s3 = "#Blob" ascii
        $s4 = "get_URL" ascii
        $s5 = "set_URL" ascii
        $s6 = "DecryptIePassword" ascii
        $s8 = "GetURLHashString" ascii
        $s9 = "DoesURLMatchWithHash" ascii

        $f0 = "GetSavedPasswords" ascii
        $f1 = "IESecretHeader" ascii
        $f2 = "RecoveredBrowserAccount" ascii
        $f4 = "PasswordDerivedBytes" ascii
        $f5 = "get_ASCII" ascii
        $f6 = "get_ComputerName" ascii
        $f7 = "get_WebServices" ascii
        $f8 = "get_UserName" ascii
        $f9 = "get_OSFullName" ascii
        $f10 = "ComputerInfo" ascii
        $f11 = "set_Sendwebcam" ascii
        $f12 = "get_Clipboard" ascii
        $f13 = "get_TotalFreeSpace" ascii
        $f14 = "get_IsAttached" ascii

        $x0 = "IELibrary.dll" ascii wide
        $x1 = "webpanel" ascii wide nocase
        $x2 = "smtp" ascii wide nocase

        $v5 = "vmware" ascii wide nocase
        $v6 = "VirtualBox" ascii wide nocase
        $v7 = "vbox" ascii wide nocase
        $v9 = "avghookx.dll" ascii wide nocase

        $pdb = "IELibrary.pdb" ascii
    condition:
        (
            (
                5 of ($s*) or
                7 of ($f*)
            ) and
            all of ($x*) and
            all of ($v*) and
            $pdb
        )
}
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