Analysis

  • max time kernel
    130s
  • max time network
    141s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241211-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241211-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    12-01-2025 03:25

General

  • Target

    resembleC2.exe

  • Size

    763KB

  • MD5

    f70fb0eacdba5672bd67ff9ad29e425b

  • SHA1

    35c7ad26473afb12c8b46dfb51f3e0d73b92a7eb

  • SHA256

    325ec7369a18af43c95815bacf830f5bcd1093436c25f67685226fe0d4812280

  • SHA512

    e93012796de946c4b009d9c68a539ea010d88952c11ddd0fc05d3d4ebe1657f16a7f75269e2c6075c12564f40752c7f4aec0c64583ffb46d06ec69431e5f6ff5

  • SSDEEP

    12288:wjB1GbyBRc8nAVCCpViLkSdIi/NvFFuHtHylX5mmYKlzQUG1R9qRst2hmKyL/mVD:wjB1myBRccwf/SdNFvFFu1yh5zlzY1RS

Malware Config

Signatures

  • Detect Umbral payload 2 IoCs
  • Umbral

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

  • Umbral family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

  • Drops file in Drivers directory 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 3 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

  • Drops desktop.ini file(s) 2 IoCs
  • 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.

  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Modifies registry class 2 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 46 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 34 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\resembleC2.exe
    "C:\Users\Admin\AppData\Local\Temp\resembleC2.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:5016
    • C:\Users\Admin\AppData\Local\Temp\resemble.exe
      "C:\Users\Admin\AppData\Local\Temp\resemble.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:664
      • C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:2776
    • C:\Users\Admin\AppData\Local\Temp\MoonHub.exe
      "C:\Users\Admin\AppData\Local\Temp\MoonHub.exe"
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3288
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1776
      • C:\Windows\SYSTEM32\attrib.exe
        "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\MoonHub.exe"
        3⤵
        • Views/modifies file attributes
        PID:820
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\MoonHub.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3888
      • 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
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:2004
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:1852
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        PID:1688
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" os get Caption
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        PID:2532
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" computersystem get totalphysicalmemory
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        PID:4612
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        PID:3924
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:1396
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic" path win32_VideoController get name
        3⤵
        • Detects videocard installed
        • Suspicious behavior: EnumeratesProcesses
        PID:4056
      • C:\Windows\SYSTEM32\cmd.exe
        "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\MoonHub.exe" && pause
        3⤵
        • System Network Configuration Discovery: Internet Connection Discovery
        • Suspicious use of WriteProcessMemory
        PID:4192
        • C:\Windows\system32\PING.EXE
          ping localhost
          4⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Runs ping.exe
          PID:2964
  • C:\Windows\system32\OpenWith.exe
    C:\Windows\system32\OpenWith.exe -Embedding
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:4888

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

    3KB

    MD5

    3eb3833f769dd890afc295b977eab4b4

    SHA1

    e857649b037939602c72ad003e5d3698695f436f

    SHA256

    c485a6e2fd17c342fca60060f47d6a5655a65a412e35e001bb5bf88d96e6e485

    SHA512

    c24bbc8f278478d43756807b8c584d4e3fb2289db468bc92986a489f74a8da386a667a758360a397e77e018e363be8912ac260072fa3e31117ad0599ac749e72

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

    Filesize

    1KB

    MD5

    43a63637614b06cf4ca7e1b85c25b071

    SHA1

    1fefef7f0dfef9f9ba248f168a0c85314f5f4053

    SHA256

    0f3ec5a874fe41abd67013b8481610202272468333616bf098ced19c1f271e6b

    SHA512

    6396d789420a8a13367483ec6d7f288e437cf75527f11132285738587ce549f95587c32c56d023008b5725e465a76da244093707079b13216c057a550b4cc1d0

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

    Filesize

    1KB

    MD5

    60b3262c3163ee3d466199160b9ed07d

    SHA1

    994ece4ea4e61de0be2fdd580f87e3415f9e1ff6

    SHA256

    e3b30f16d41f94cba2b8a75f35c91ae7418465abfbfe5477ec0551d1952b2fdb

    SHA512

    081d2015cb94477eb0fbc38f44b6d9b4a3204fb3ad0b7d0e146a88ab4ab9a0d475207f1adae03f4a81ccc5beb7568dc8be1249f69e32fe56efd9ee2f6ee3b1af

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

    Filesize

    948B

    MD5

    8e120be675cae7efeda4d34b327c9681

    SHA1

    f0bf3d389fd8e9f8a4040ac30395fe5b0e11d438

    SHA256

    acd32ca4ecf5904c47cdaa22a05da184e2083447ca8a94e7468bc7e5a8f00151

    SHA512

    957489c4b6b606231aea76475b99826e8d8e045e5973d4770ee2fd2f7ebd9e79472324d7baa8539aa84482e8b774ac1b0e08ae4e983eda48dda7951400ef67da

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

    Filesize

    1KB

    MD5

    8e1fdd1b66d2fee9f6a052524d4ddca5

    SHA1

    0a9d0994559d1be2eecd8b0d6960540ca627bdb6

    SHA256

    4cc7c1b79d1b48582d4dc27ca8c31457b9bf2441deb7914399bb9e6863f18b13

    SHA512

    5a5494b878b08e8515811ab7a3d68780dac7423f5562477d98249a8bedf7ec98567b7cd5d4c6967d6bc63f2d6d9b7da9a65e0eb29d4b955026b469b5b598d1f3

  • C:\Users\Admin\AppData\Local\Temp\MoonHub.exe

    Filesize

    231KB

    MD5

    f70b5e56a09af292d4e909c547f9c8c0

    SHA1

    577883bdbe8dc9582e15e7a1212b1fe432bafce3

    SHA256

    8fd22c5acb3144dbaa5ab3f9dd5901eb6f3beef67e72ea431246c6a790c067de

    SHA512

    e54ccb56aa6473abd3530493933d5164f2dff02076e0f03443382f02d177a52e318d8d0f432e6a3fb5620eaffd09f2dbf6ccbf9698ba149b149c594fa162d879

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_boyvtkau.m52.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Local\Temp\resemble.exe

    Filesize

    845KB

    MD5

    56edb111575113d40af0f1c028dcb315

    SHA1

    018a7abc977ba73e2f66f1e7bf041191089c100c

    SHA256

    c7b542ac39e8e5a14ef0cd70dc3bb505cbdbef4d737c7cb310353642ca914235

    SHA512

    2c87ad1db2ce3745426eb47e76b855124e97747d895d8f5b90adf9018a03c6059dc96537429cf03e2d9af51ca49b751c418820d7a27557e33b8ef54f7305c406

  • C:\Users\Admin\AppData\Local\Temp\resemble.py

    Filesize

    27KB

    MD5

    23f1fabaef532d89fcb6d5bb14a36ef3

    SHA1

    679a82ed172d49f298bf07b6fa0de9b6c2ce0046

    SHA256

    e4410bc67b1ee8af2df456713b85040917b8cf749fb7d660feeb625b25ec9c51

    SHA512

    96e2baa6ce0220b9ad167b60220c683d5b080a9ba9a2e4d320aae6989f4aa2d241f8078e69bdd2da39a20d9b57ae84240da912d29e5e1db36cc90cf6a0537458

  • memory/664-28-0x0000000001310000-0x0000000001320000-memory.dmp

    Filesize

    64KB

  • memory/3288-69-0x000001B0FF780000-0x000001B0FF7F6000-memory.dmp

    Filesize

    472KB

  • memory/3288-38-0x000001B0FD040000-0x000001B0FD080000-memory.dmp

    Filesize

    256KB

  • memory/3288-70-0x000001B0FF4C0000-0x000001B0FF510000-memory.dmp

    Filesize

    320KB

  • memory/3288-71-0x000001B0FF800000-0x000001B0FF81E000-memory.dmp

    Filesize

    120KB

  • memory/3288-95-0x000001B0FF830000-0x000001B0FF83A000-memory.dmp

    Filesize

    40KB

  • memory/3288-96-0x000001B0FF860000-0x000001B0FF872000-memory.dmp

    Filesize

    72KB

  • memory/3888-44-0x000001726C550000-0x000001726C572000-memory.dmp

    Filesize

    136KB

  • memory/5016-1-0x00007FFCC04F0000-0x00007FFCC07E6000-memory.dmp

    Filesize

    3.0MB

  • memory/5016-39-0x00007FFCC04F0000-0x00007FFCC07E6000-memory.dmp

    Filesize

    3.0MB

  • memory/5016-3-0x00007FFCC04F0000-0x00007FFCC07E6000-memory.dmp

    Filesize

    3.0MB

  • memory/5016-0-0x0000000000010000-0x00000000000D6000-memory.dmp

    Filesize

    792KB