54fe6edf9984389e95e425706b85706ea2fc6e8f51631e89eec2df36c5636025

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
27-09-2024 03:32

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General

Target

sihost.exe
Size

47KB
MD5

ddfa99c0629fae91dc5aa17e45a2a8bd
SHA1

53abd5f26f2ac7d1fb93bd9d57797fba01341586
SHA256

54fe6edf9984389e95e425706b85706ea2fc6e8f51631e89eec2df36c5636025
SHA512

770f9847ffc43918671fa29b55ca061e17cde564541a07c3f55c5ecfb28629d73ed94c8b49f43a77ea17ed43e09f7cb22690db9b124b1698d71e34c265a3c6eb
SSDEEP

768:6jpwvigowz21xEHUTZhfff8gkOzrGm/06a5bQBvzigDcXSxm91fwZYBxkr:spd1FEHWf38gXr7/06CbuDgXSxm9xwao

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\System32\\userinit.exe,C:\\Windows\\lsass"	sihost.exe

Executes dropped EXE 1 IoCs

pid	Process
2292	lsass

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\ctfmon	lsass
File created	C:\Program Files\ctfmon	sihost.exe
File opened for modification	C:\Program Files\ctfmon	sihost.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\lsass	sihost.exe
File opened for modification	C:\Windows\lsass	sihost.exe
File opened for modification	C:\Windows\lsass	lsass

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
4584	schtasks.exe
4204	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4532	sihost.exe
Token: SeDebugPrivilege	2292	lsass
Token: SeIncBasePriorityPrivilege	2292	lsass

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4532 wrote to memory of 3412	4532	sihost.exe	84
PID 4532 wrote to memory of 3412	4532	sihost.exe	84
PID 4532 wrote to memory of 4388	4532	sihost.exe	85
PID 4532 wrote to memory of 4388	4532	sihost.exe	85
PID 4532 wrote to memory of 316	4532	sihost.exe	88
PID 4532 wrote to memory of 316	4532	sihost.exe	88
PID 316 wrote to memory of 4204	316	cmd.exe	90
PID 316 wrote to memory of 4204	316	cmd.exe	90
PID 4388 wrote to memory of 4584	4388	cmd.exe	91
PID 4388 wrote to memory of 4584	4388	cmd.exe	91

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\sihost.exe
"C:\Users\Admin\AppData\Local\Temp\sihost.exe"
1⤵
- Modifies WinLogon for persistence
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4532
- C:\Windows\SYSTEM32\CMD.exe
  "CMD" netsh advfirewall firewall add rule name="4ka>GAhQGa3lG;" dir=in action=allow program="C:\Windows\lsass" enable=yes & exit
  2⤵
  PID:3412
- C:\Windows\SYSTEM32\cmd.exe
  "cmd" /c schtasks /create /f /sc minute /mo 1 /tn "smss" /tr "C:\Windows\lsass" /RL HIGHEST & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4388
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc minute /mo 1 /tn "smss" /tr "C:\Windows\lsass" /RL HIGHEST
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4584
- C:\Windows\SYSTEM32\cmd.exe
  "cmd" /c schtasks /create /f /sc minute /mo 30 /tn "sihost" /tr "C:\Program Files\ctfmon" /RL HIGHEST & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:316
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc minute /mo 30 /tn "sihost" /tr "C:\Program Files\ctfmon" /RL HIGHEST
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4204

C:\Windows\lsass
C:\Windows\lsass
1⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:2292

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/4532-1-0x0000000000090000-0x00000000000A0000-memory.dmp

Filesize
64KB

Download
memory/4532-0-0x00007FF9C4C83000-0x00007FF9C4C85000-memory.dmp

Filesize
8KB

Download
memory/4532-10-0x00007FF9C4C80000-0x00007FF9C5741000-memory.dmp

Filesize
10.8MB

Download
memory/4532-18-0x00007FF9C4C80000-0x00007FF9C5741000-memory.dmp

Filesize
10.8MB

Download
memory/4532-57-0x00007FF9C4C80000-0x00007FF9C5741000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads