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Analysis

  • max time kernel
    145s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/02/2024, 01:02

General

  • Target

    sinfulsassist.exe

  • Size

    232KB

  • MD5

    6bd66ae3d6ad55de0d3bfd026ab642f8

  • SHA1

    b9c03630edcb053a0f14970ea7085a8a2a285d8a

  • SHA256

    80e1636664daed3c4c919584a40b1404807ff859fcb98267abdbe487c9a16c1f

  • SHA512

    c776fe3939329bfd47c447d069f89976acedb90853ab3d16386afab6123c7f1dfd9aadbbefa458226c4065452fdfd6d5dfc0a8162950d65818d7039ab92513fa

  • SSDEEP

    6144:tloZMArIkd8g+EtXHkv/iD4xR8KfVealwgRj++71Nb8e1mRi:voZHL+EP8xR8KfVealwgRj++7X3

Score
10/10

Malware Config

Signatures

  • Detect Umbral payload 1 IoCs
  • Umbral

    Umbral stealer is an opensource moduler stealer written in C#.

  • Drops file in Drivers directory 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\sinfulsassist.exe
    "C:\Users\Admin\AppData\Local\Temp\sinfulsassist.exe"
    1⤵
    • Drops file in Drivers directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5044
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\sinfulsassist.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4240
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:220
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4940
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2288
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2688
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2880
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
        PID:3108
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        PID:3388
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic" path win32_VideoController get name
        2⤵
        • Detects videocard installed
        PID:1436

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      2KB

      MD5

      d85ba6ff808d9e5444a4b369f5bc2730

      SHA1

      31aa9d96590fff6981b315e0b391b575e4c0804a

      SHA256

      84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

      SHA512

      8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      1KB

      MD5

      5423eae8a66353bd7e5a09531a03c014

      SHA1

      3ca22804ba343bd0dc2b2124990b082c024b7b3c

      SHA256

      a6066c1711139e9e4844faf543d5818a4613d6c1baeb8040aaca15c19ca3339f

      SHA512

      20e952424eb88f8268510c6b1de19ce796a624a19a4460fcaab915993a5c324c176e56d66eb8735a2c81731077868c6018ec938ac7215d739c9fa96a1182f515

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      6d3e9c29fe44e90aae6ed30ccf799ca8

      SHA1

      c7974ef72264bbdf13a2793ccf1aed11bc565dce

      SHA256

      2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

      SHA512

      60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      948B

      MD5

      c9b6705519e1eef08f86c4ba5f4286f3

      SHA1

      6c6b179e452ecee2673a1d4fe128f1c06f70577f

      SHA256

      0f9cad44a79126871580e19b01dc3f880c5173b1faaf8b9018d5d1f829714705

      SHA512

      6d8f85a7a8b0b124530f36a157cd0441b5c1eacdc35e274af9fbf0569d03d1d5e468651a5b2425f0215c282ecfa7b1ffeaeeaf18612822f00bd14306d30640c7

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      1KB

      MD5

      276798eeb29a49dc6e199768bc9c2e71

      SHA1

      5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

      SHA256

      cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

      SHA512

      0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_kibk2ohz.h2a.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • memory/220-22-0x00000264E9FE0000-0x00000264E9FF0000-memory.dmp

      Filesize

      64KB

    • memory/220-35-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/220-33-0x00000264E9FE0000-0x00000264E9FF0000-memory.dmp

      Filesize

      64KB

    • memory/220-20-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/220-21-0x00000264E9FE0000-0x00000264E9FF0000-memory.dmp

      Filesize

      64KB

    • memory/2288-78-0x0000020FCB0D0000-0x0000020FCB0E0000-memory.dmp

      Filesize

      64KB

    • memory/2288-85-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/2288-81-0x0000020FCB0D0000-0x0000020FCB0E0000-memory.dmp

      Filesize

      64KB

    • memory/2288-70-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/3388-91-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/3388-104-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/3388-92-0x0000021D386E0000-0x0000021D386F0000-memory.dmp

      Filesize

      64KB

    • memory/4240-14-0x0000023F7A7A0000-0x0000023F7A7B0000-memory.dmp

      Filesize

      64KB

    • memory/4240-15-0x0000023F7A7A0000-0x0000023F7A7B0000-memory.dmp

      Filesize

      64KB

    • memory/4240-13-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/4240-18-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/4240-8-0x0000023F7A8E0000-0x0000023F7A902000-memory.dmp

      Filesize

      136KB

    • memory/4940-42-0x0000028839BB0000-0x0000028839BC0000-memory.dmp

      Filesize

      64KB

    • memory/4940-68-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/4940-66-0x0000028839BB0000-0x0000028839BC0000-memory.dmp

      Filesize

      64KB

    • memory/4940-43-0x0000028839BB0000-0x0000028839BC0000-memory.dmp

      Filesize

      64KB

    • memory/4940-41-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/5044-40-0x000002348DFD0000-0x000002348DFEE000-memory.dmp

      Filesize

      120KB

    • memory/5044-2-0x000002348E050000-0x000002348E060000-memory.dmp

      Filesize

      64KB

    • memory/5044-83-0x000002348E050000-0x000002348E060000-memory.dmp

      Filesize

      64KB

    • memory/5044-0-0x000002348C350000-0x000002348C390000-memory.dmp

      Filesize

      256KB

    • memory/5044-87-0x000002348E000000-0x000002348E00A000-memory.dmp

      Filesize

      40KB

    • memory/5044-88-0x000002348E030000-0x000002348E042000-memory.dmp

      Filesize

      72KB

    • memory/5044-69-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/5044-39-0x00000234A6B20000-0x00000234A6B70000-memory.dmp

      Filesize

      320KB

    • memory/5044-1-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB

    • memory/5044-38-0x000002348E180000-0x000002348E1F6000-memory.dmp

      Filesize

      472KB

    • memory/5044-109-0x00007FF8445E0000-0x00007FF8450A1000-memory.dmp

      Filesize

      10.8MB