Analysis

  • max time kernel
    90s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    13/05/2022, 16:24

General

  • Target

    sample.exe

  • Size

    1.4MB

  • MD5

    91cae6b4bbd4fbe83589e011495d9844

  • SHA1

    c3a768d10abb78f0909bfa5d2f05da39abf99fe2

  • SHA256

    4089e7b0a0469bd5877c830f962f8243dc1311349271e45e9b15cd6d97e0a2ea

  • SHA512

    90b37b1930b75cb7b74d0e18e327434842f8b1fa472f9c25a6f238ab7455282287eeef98dd9b0965d00761e9e0bca20073e7cde9e850e2f8071ad1eb8f6c761a

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 3 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Executes dropped EXE 1 IoCs
  • Modifies extensions of user files 4 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 3 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Drops desktop.ini file(s) 64 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Interacts with shadow copies 2 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 51 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\sample.exe
    "C:\Users\Admin\AppData\Local\Temp\sample.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3000
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Executes dropped EXE
      • Modifies extensions of user files
      • Checks computer location settings
      • Drops startup file
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1924
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3700
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2212
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4856
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3684
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3748
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4768
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2580
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3204
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\how to decrypt.txt
        3⤵
          PID:3252
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4348
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1444
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:3424
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
        • Checks SCSI registry key(s)
        PID:2916
      • C:\Windows\system32\WerFault.exe
        C:\Windows\system32\WerFault.exe -pss -s 444 -p 2840 -ip 2840
        1⤵
          PID:2488
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2840 -s 1572
          1⤵
          • Program crash
          PID:4936

        Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\sample.exe.log

          Filesize

          226B

          MD5

          28d7fcc2b910da5e67ebb99451a5f598

          SHA1

          a5bf77a53eda1208f4f37d09d82da0b9915a6747

          SHA256

          2391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c

          SHA512

          2d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6

        • C:\Users\Admin\AppData\Roaming\how to decrypt.txt

          Filesize

          1KB

          MD5

          4a39693ddd41ed275bf5497994cd7b7d

          SHA1

          2c7807533d480096762d2e7d965589da684404c3

          SHA256

          9c16a43660f3308606981e31b020d40e97e3e1fcb037b43e0bc7a5283259aec9

          SHA512

          ee9c5637463713f54e7c4334326b9da4045646e348f078626e7e3a98c52b28f5a20a536a2084a0ec919edce015d6e7d144e9e72df85687ecf620a02bd0a273c1

        • C:\Users\Admin\AppData\Roaming\svchost.exe

          Filesize

          1.4MB

          MD5

          91cae6b4bbd4fbe83589e011495d9844

          SHA1

          c3a768d10abb78f0909bfa5d2f05da39abf99fe2

          SHA256

          4089e7b0a0469bd5877c830f962f8243dc1311349271e45e9b15cd6d97e0a2ea

          SHA512

          90b37b1930b75cb7b74d0e18e327434842f8b1fa472f9c25a6f238ab7455282287eeef98dd9b0965d00761e9e0bca20073e7cde9e850e2f8071ad1eb8f6c761a

        • C:\Users\Admin\AppData\Roaming\svchost.exe

          Filesize

          1.4MB

          MD5

          91cae6b4bbd4fbe83589e011495d9844

          SHA1

          c3a768d10abb78f0909bfa5d2f05da39abf99fe2

          SHA256

          4089e7b0a0469bd5877c830f962f8243dc1311349271e45e9b15cd6d97e0a2ea

          SHA512

          90b37b1930b75cb7b74d0e18e327434842f8b1fa472f9c25a6f238ab7455282287eeef98dd9b0965d00761e9e0bca20073e7cde9e850e2f8071ad1eb8f6c761a

        • memory/1924-135-0x00007FFF94750000-0x00007FFF95211000-memory.dmp

          Filesize

          10.8MB

        • memory/3000-130-0x0000000000F00000-0x0000000001070000-memory.dmp

          Filesize

          1.4MB

        • memory/3000-131-0x00007FFF94750000-0x00007FFF95211000-memory.dmp

          Filesize

          10.8MB