Analysis

  • max time kernel
    86s
  • max time network
    87s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    06-01-2021 17:56

Errors

Reason
Machine shutdown

General

  • Target

    Build.exe

  • Size

    533KB

  • MD5

    be064c1864b02feab6d41ed1a0ecf2a0

  • SHA1

    be285923433bbd32e8c896bb71910180a15cf61f

  • SHA256

    d2b4d092f178023c22ec781d1ead02de46a5b5b159cc1930220e44d9f1168225

  • SHA512

    4aad663524f7f012c438940040b2a3c0a9e552b5a64306827cb3deb642cacae54ca62a70fa9b2261681f14dfd67feb07eb80e6196b320d8b400f45aa303cb40c

Malware Config

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • Echelon

    Echelon is a .NET stealer that targets passwords from browsers, email and cryptocurrency clients.

  • AgentTesla Payload 1 IoCs
  • Echelon log file 1 IoCs

    Detects a log file produced by Echelon.

  • Deletes itself 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Looks up external IP address via web service 4 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 14 IoCs
  • Delays execution with timeout.exe 1 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Build.exe
    "C:\Users\Admin\AppData\Local\Temp\Build.exe"
    1⤵
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2008
    • C:\Windows\system32\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp66BF.tmp.cmd""
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:652
      • C:\Windows\system32\timeout.exe
        timeout 4
        3⤵
        • Delays execution with timeout.exe
        PID:1972
  • C:\Windows\system32\LogonUI.exe
    "LogonUI.exe" /flags:0x0
    1⤵
      PID:1660
    • C:\Windows\system32\AUDIODG.EXE
      C:\Windows\system32\AUDIODG.EXE 0x560
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1232
    • C:\Windows\system32\LogonUI.exe
      "LogonUI.exe" /flags:0x1
      1⤵
        PID:700

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\tmp66BF.tmp.cmd

        MD5

        88f63ee2513c67d4c84d87560ba2cc33

        SHA1

        9e08c0cf906ae36c85e66ab8ddd458b3cce3e65a

        SHA256

        161c17781e42c75096ebe2f34c35fe0d035d5d76baa176cf784aa4eacbdf9edc

        SHA512

        c1344366005f896f333272b0377d4b2086c9c5ae859baf0f34f3893d496097292b78a55bda0bae7a51e4c159134bf01cc086d6fca38aa2170fb7b9670f17ba8d

      • memory/652-6-0x0000000000000000-mapping.dmp

      • memory/1972-8-0x0000000000000000-mapping.dmp

      • memory/2008-2-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

        Filesize

        9.9MB

      • memory/2008-3-0x0000000000390000-0x0000000000391000-memory.dmp

        Filesize

        4KB

      • memory/2008-5-0x000000001AF60000-0x000000001B06A000-memory.dmp

        Filesize

        1.0MB