Analysis

  • max time kernel
    121s
  • max time network
    46s
  • platform
    windows7_x64
  • resource
    win7-20220414-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 5 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 2 IoCs
  • Modifies extensions of user files 4 IoCs

    Ransomware generally changes the extension on encrypted files.

  • 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.

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\sample.exe
    "C:\Users\Admin\AppData\Local\Temp\sample.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1080
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Executes dropped EXE
      • Modifies extensions of user files
      • Drops startup file
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:900
      • 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:1792
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:316
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:288
      • 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:1944
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1060
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1624
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1444
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:844
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\how to decrypt.txt
        3⤵
          PID:1580
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1536
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1340
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:1692
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
          PID:2020
        • C:\Windows\system32\NOTEPAD.EXE
          "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\how to decrypt.txt
          1⤵
            PID:656
          • C:\Users\Admin\AppData\Roaming\svchost.exe
            "C:\Users\Admin\AppData\Roaming\svchost.exe"
            1⤵
            • Executes dropped EXE
            • Suspicious behavior: AddClipboardFormatListener
            PID:1696

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Execution

          Command-Line Interface

          1
          T1059

          Defense Evasion

          File Deletion

          3
          T1107

          Modify Registry

          1
          T1112

          Credential Access

          Credentials in Files

          1
          T1081

          Discovery

          System Information Discovery

          1
          T1082

          Collection

          Data from Local System

          1
          T1005

          Impact

          Inhibit System Recovery

          4
          T1490

          Defacement

          1
          T1491

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\how to decrypt.txt
            Filesize

            1KB

            MD5

            4a39693ddd41ed275bf5497994cd7b7d

            SHA1

            2c7807533d480096762d2e7d965589da684404c3

            SHA256

            9c16a43660f3308606981e31b020d40e97e3e1fcb037b43e0bc7a5283259aec9

            SHA512

            ee9c5637463713f54e7c4334326b9da4045646e348f078626e7e3a98c52b28f5a20a536a2084a0ec919edce015d6e7d144e9e72df85687ecf620a02bd0a273c1

          • 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

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

            1.4MB

            MD5

            91cae6b4bbd4fbe83589e011495d9844

            SHA1

            c3a768d10abb78f0909bfa5d2f05da39abf99fe2

            SHA256

            4089e7b0a0469bd5877c830f962f8243dc1311349271e45e9b15cd6d97e0a2ea

            SHA512

            90b37b1930b75cb7b74d0e18e327434842f8b1fa472f9c25a6f238ab7455282287eeef98dd9b0965d00761e9e0bca20073e7cde9e850e2f8071ad1eb8f6c761a

          • memory/288-61-0x0000000000000000-mapping.dmp
          • memory/316-60-0x0000000000000000-mapping.dmp
          • memory/844-66-0x0000000000000000-mapping.dmp
          • memory/844-67-0x000007FEFBC21000-0x000007FEFBC23000-memory.dmp
            Filesize

            8KB

          • memory/900-58-0x00000000013E0000-0x0000000001550000-memory.dmp
            Filesize

            1.4MB

          • memory/900-55-0x0000000000000000-mapping.dmp
          • memory/1060-63-0x0000000000000000-mapping.dmp
          • memory/1080-54-0x0000000001140000-0x00000000012B0000-memory.dmp
            Filesize

            1.4MB

          • memory/1444-65-0x0000000000000000-mapping.dmp
          • memory/1580-68-0x0000000000000000-mapping.dmp
          • memory/1624-64-0x0000000000000000-mapping.dmp
          • memory/1792-59-0x0000000000000000-mapping.dmp
          • memory/1944-62-0x0000000000000000-mapping.dmp