Resubmissions

19-01-2025 17:36

250119-v6zj9sykbs 10

19-01-2025 17:36

250119-v6jh2syngr 10

19-01-2025 16:37

250119-t5adbawrcp 10

Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20250113-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20250113-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    19-01-2025 17:36

General

  • Target

    Nerest sofr/!LOADER.exe

  • Size

    125KB

  • MD5

    0324d4d7ff2026809d8c3f4bd0f3573e

  • SHA1

    73f39a2778bbaa29246a75a7274b8bc7836bd329

  • SHA256

    e14dbac690979b4fa9b2fee4a8221bfdcb03500458d3f9c8912fa1e0e4674492

  • SHA512

    0209d6abb503a2698ee3bb8393da8b7622c3f6318f7aff8173a2406abc31d5d422002ab47113a85e2b7dc292d6735c23fd083aa1c1de4dd275a6e0f28e091f6b

  • SSDEEP

    3072:3uZ+4zKUSfFzqbaQgKA64kCOd4pUzaewwQU4OHRemSL:3gKJFzqb3A64kK+zBuU4OIm

Malware Config

Extracted

Family

xworm

C2

back-spots.gl.at.ply.gg:21395

Attributes
  • Install_directory

    %Temp%

  • install_file

    USB.exe

Signatures

  • Detect Xworm Payload 2 IoCs
  • UAC bypass 3 TTPs 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Xworm 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.

  • Event Triggered Execution: Image File Execution Options Injection 1 TTPs 4 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 2 IoCs
  • Executes dropped EXE 4 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 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.

  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • 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.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Nerest sofr\!LOADER.exe
    "C:\Users\Admin\AppData\Local\Temp\Nerest sofr\!LOADER.exe"
    1⤵
    • Checks computer location settings
    • Drops startup file
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4756
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Nerest sofr\!LOADER.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4256
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '!LOADER.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:756
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\conhost'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2668
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'conhost'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      PID:3324
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "conhost" /tr "C:\Users\Admin\AppData\Local\Temp\conhost"
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2104
    • C:\Users\Admin\AppData\Local\Temp\unsszg.exe
      "C:\Users\Admin\AppData\Local\Temp\unsszg.exe"
      2⤵
      • UAC bypass
      • Event Triggered Execution: Image File Execution Options Injection
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Writes to the Master Boot Record (MBR)
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • System policy modification
      PID:944
  • C:\Users\Admin\AppData\Local\Temp\conhost
    "C:\Users\Admin\AppData\Local\Temp\conhost"
    1⤵
    • Executes dropped EXE
    PID:1756
  • C:\Users\Admin\AppData\Local\Temp\conhost
    "C:\Users\Admin\AppData\Local\Temp\conhost"
    1⤵
    • Executes dropped EXE
    PID:2344
  • C:\Users\Admin\AppData\Local\Temp\unsszg.exe
    C:\Users\Admin\AppData\Local\Temp\unsszg.exe explorer.exe
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious use of SetWindowsHookEx
    PID:4952

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    654B

    MD5

    11c6e74f0561678d2cf7fc075a6cc00c

    SHA1

    535ee79ba978554abcb98c566235805e7ea18490

    SHA256

    d39a78fabca39532fcb85ce908781a75132e1bd01cc50a3b290dd87127837d63

    SHA512

    32c63d67bf512b42e7f57f71287b354200126cb417ef9d869c72e0b9388a7c2f5e3b61f303f1353baa1bf482d0f17e06e23c9f50b2f1babd4d958b6da19c40b0

  • 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

    6a807b1c91ac66f33f88a787d64904c1

    SHA1

    83c554c7de04a8115c9005709e5cd01fca82c5d3

    SHA256

    155314c1c86d8d4e5b802f1eef603c5dd4a2f7c949f069a38af5ba4959bd8256

    SHA512

    29f2d9f30fc081e7fe6e9fb772c810c9be0422afdc6aff5a286f49a990ededebcf0d083798c2d9f41ad8434393c6d0f5fa6df31226d9c3511ba2a41eb4a65200

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

    Filesize

    1KB

    MD5

    79746cd4afed7fd14cb13cd145136c65

    SHA1

    ea7097a42b05cc684b8ff034f5ac6e952a92cb03

    SHA256

    871da5dca905d702b2be2c905a8d00d5a80be53791ab4433664e582ac98ba9ea

    SHA512

    31fe60352d385911fa0ebcc21aef64bb8a8dadc124a716a42b9d9541c0c080446c54045d91b244738dd66b33d8bdad87c2acd72b0cf0b77aa3754ff94119f7bd

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

    Filesize

    1KB

    MD5

    74561307243e441f4fa8fe368e39bb11

    SHA1

    4061d097677f3845352347b9da31437f9899b2b9

    SHA256

    65209d1772df3a89db097e283a5935a59b444d385d74e00de5a0daed2f714141

    SHA512

    321abe316c5d0d57b30cc32d0e495bc1fe6a76cbe3dce2ba2110de0dce1fb9c0a3355a3a6096055b009bc3c936ae6f0ba31575cbfb7ca25fe76c3c3cf0795e4e

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4b5ceejm.1hj.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Local\Temp\conhost

    Filesize

    125KB

    MD5

    0324d4d7ff2026809d8c3f4bd0f3573e

    SHA1

    73f39a2778bbaa29246a75a7274b8bc7836bd329

    SHA256

    e14dbac690979b4fa9b2fee4a8221bfdcb03500458d3f9c8912fa1e0e4674492

    SHA512

    0209d6abb503a2698ee3bb8393da8b7622c3f6318f7aff8173a2406abc31d5d422002ab47113a85e2b7dc292d6735c23fd083aa1c1de4dd275a6e0f28e091f6b

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

    Filesize

    2.5MB

    MD5

    fde17f9dc51d98f687d99c96fd6b2c6f

    SHA1

    341aff5cb511787583c989d11ec5b2855c7f833a

    SHA256

    566f839acfb340e4b94fe8a9177035bb974ac078a58a8774ad22d297fa3caf48

    SHA512

    28ca1b3184e32f2433331c1d8a7d50b66dacfbe65cc4396fd0e9c68445a4427b2fb2faa9736f906e4a323640f2d18594b69b0f7e0feedd3a423fc1c6d40b23f0

  • memory/4256-20-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4256-19-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4256-16-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4256-15-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4256-14-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4256-13-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4256-5-0x0000013241320000-0x0000013241342000-memory.dmp

    Filesize

    136KB

  • memory/4756-0-0x00007FFE9E473000-0x00007FFE9E475000-memory.dmp

    Filesize

    8KB

  • memory/4756-58-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4756-63-0x000000001BC20000-0x000000001BC2C000-memory.dmp

    Filesize

    48KB

  • memory/4756-2-0x00007FFE9E470000-0x00007FFE9EF32000-memory.dmp

    Filesize

    10.8MB

  • memory/4756-1-0x00000000003F0000-0x0000000000416000-memory.dmp

    Filesize

    152KB

  • memory/4952-79-0x0000000000400000-0x00000000006CC000-memory.dmp

    Filesize

    2.8MB