Analysis

  • max time kernel
    102s
  • max time network
    127s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    17/03/2023, 03:27

General

  • Target

    984eb11b3f5de9345be40b9fdf432400.rtf

  • Size

    13KB

  • MD5

    984eb11b3f5de9345be40b9fdf432400

  • SHA1

    dcdb7a00279a40aec32c7cb48d83b110155ceb22

  • SHA256

    d613285ecc373bd6fcc8453ef8e877adba090dbe1a2a585bee5d15865c7ecd62

  • SHA512

    b92ba5b3f37bf57659966d7d8b51a02bbc68081028c6626724fe7a5251c3756816a2013bb7c24eb36dc2f098eb30b39802b04449d276b91c5b6c40574e41824c

  • SSDEEP

    384:8p72r5s4pRAefFUUCpT/qxfRrVvSBx1/j3JQeKr:8p6r5suAeP4T/kTSBb/rM

Malware Config

Extracted

Family

agenttesla

Credentials

Signatures

  • AgentTesla

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

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Drops file in System32 directory 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Office loads VBA resources, possible macro or embedded object present
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\984eb11b3f5de9345be40b9fdf432400.rtf"
    1⤵
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1212
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
        PID:1560
    • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
      "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
      1⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Launches Equation Editor
      • Suspicious use of WriteProcessMemory
      PID:1220
      • C:\Users\Public\vbc.exe
        "C:\Users\Public\vbc.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:964
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\zZmFoHU.exe"
          3⤵
          • Drops file in System32 directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2036
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\zZmFoHU" /XML "C:\Users\Admin\AppData\Local\Temp\tmpE8AB.tmp"
          3⤵
          • Creates scheduled task(s)
          PID:1652
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
          3⤵
          • Accesses Microsoft Outlook profiles
          • Adds Run key to start application
          • Suspicious use of AdjustPrivilegeToken
          • outlook_office_path
          • outlook_win_path
          PID:1188

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmpE8AB.tmp

      Filesize

      1KB

      MD5

      5b1c78be1de2b4155342262cdea66865

      SHA1

      9342c57b8548bbd84a9746470c4e45ef415a7d15

      SHA256

      09b3fe231b5a98dc4b721364ec7f2906b15b801341dd6d8dc07dfbd780bec219

      SHA512

      ef70bc9ff78bedbce9a9554c9cc771548af1377356fea891e14b6dbeb986a29e537fe8ffc369cf43eb52661f1e8e980a9d38679553255c9264a14dd255dc4cda

    • C:\Users\Admin\AppData\Roaming\Microsoft\Templates\Normal.dotm

      Filesize

      20KB

      MD5

      285d168244736440d8be529ff0019112

      SHA1

      cee835b5038561eb3cf18a4171cb95160a462917

      SHA256

      ce2e5e662367e6a8119df06fda6ad69847aa9feeb6de342d69cbd00ea3adfba5

      SHA512

      37696fe0fde1ed55a28c544a356b68152646421f15f061ae2ae1eb9d3263798f6dcd304685a3be98e43a68751d42d3d46bcef879738a91a07b0b2849d2a821d8

    • C:\Users\Public\vbc.exe

      Filesize

      803KB

      MD5

      52566f0ff46e8a99d07c8d4cb46b3ee8

      SHA1

      460eefd5f85943be96281f95a477eb27bc0a62bc

      SHA256

      d6e9b82599fcecb2866035aeea05ad9e614a42dd7649aea6985a22534bfa6768

      SHA512

      2f61e49edc1c9e7b8d8a57069568bb11ac8c80cbe3f32cedd2b457c45b64483c8f069f27a3db156dcfe53279cdc5e47575f7978d3662c8dccde676bb82a1c5d5

    • C:\Users\Public\vbc.exe

      Filesize

      803KB

      MD5

      52566f0ff46e8a99d07c8d4cb46b3ee8

      SHA1

      460eefd5f85943be96281f95a477eb27bc0a62bc

      SHA256

      d6e9b82599fcecb2866035aeea05ad9e614a42dd7649aea6985a22534bfa6768

      SHA512

      2f61e49edc1c9e7b8d8a57069568bb11ac8c80cbe3f32cedd2b457c45b64483c8f069f27a3db156dcfe53279cdc5e47575f7978d3662c8dccde676bb82a1c5d5

    • C:\Users\Public\vbc.exe

      Filesize

      803KB

      MD5

      52566f0ff46e8a99d07c8d4cb46b3ee8

      SHA1

      460eefd5f85943be96281f95a477eb27bc0a62bc

      SHA256

      d6e9b82599fcecb2866035aeea05ad9e614a42dd7649aea6985a22534bfa6768

      SHA512

      2f61e49edc1c9e7b8d8a57069568bb11ac8c80cbe3f32cedd2b457c45b64483c8f069f27a3db156dcfe53279cdc5e47575f7978d3662c8dccde676bb82a1c5d5

    • \Users\Public\vbc.exe

      Filesize

      803KB

      MD5

      52566f0ff46e8a99d07c8d4cb46b3ee8

      SHA1

      460eefd5f85943be96281f95a477eb27bc0a62bc

      SHA256

      d6e9b82599fcecb2866035aeea05ad9e614a42dd7649aea6985a22534bfa6768

      SHA512

      2f61e49edc1c9e7b8d8a57069568bb11ac8c80cbe3f32cedd2b457c45b64483c8f069f27a3db156dcfe53279cdc5e47575f7978d3662c8dccde676bb82a1c5d5

    • memory/964-73-0x0000000004990000-0x00000000049D0000-memory.dmp

      Filesize

      256KB

    • memory/964-74-0x00000000005E0000-0x0000000000600000-memory.dmp

      Filesize

      128KB

    • memory/964-75-0x0000000004990000-0x00000000049D0000-memory.dmp

      Filesize

      256KB

    • memory/964-77-0x0000000000450000-0x000000000045C000-memory.dmp

      Filesize

      48KB

    • memory/964-78-0x0000000005710000-0x00000000057BA000-memory.dmp

      Filesize

      680KB

    • memory/964-68-0x0000000000A70000-0x0000000000B3E000-memory.dmp

      Filesize

      824KB

    • memory/964-84-0x0000000004370000-0x0000000004378000-memory.dmp

      Filesize

      32KB

    • memory/964-85-0x0000000004DB0000-0x0000000004DE2000-memory.dmp

      Filesize

      200KB

    • memory/1188-88-0x0000000000400000-0x0000000000430000-memory.dmp

      Filesize

      192KB

    • memory/1188-100-0x0000000004850000-0x0000000004890000-memory.dmp

      Filesize

      256KB

    • memory/1188-91-0x0000000000400000-0x0000000000430000-memory.dmp

      Filesize

      192KB

    • memory/1188-93-0x0000000000400000-0x0000000000430000-memory.dmp

      Filesize

      192KB

    • memory/1188-90-0x0000000000400000-0x0000000000430000-memory.dmp

      Filesize

      192KB

    • memory/1188-89-0x0000000000400000-0x0000000000430000-memory.dmp

      Filesize

      192KB

    • memory/1188-119-0x0000000004850000-0x0000000004890000-memory.dmp

      Filesize

      256KB

    • memory/1188-92-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/1188-97-0x0000000000400000-0x0000000000430000-memory.dmp

      Filesize

      192KB

    • memory/1188-99-0x0000000000400000-0x0000000000430000-memory.dmp

      Filesize

      192KB

    • memory/1212-54-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/1212-137-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/2036-96-0x00000000004F0000-0x0000000000530000-memory.dmp

      Filesize

      256KB

    • memory/2036-95-0x00000000004F0000-0x0000000000530000-memory.dmp

      Filesize

      256KB