54fe6edf9984389e95e425706b85706ea2fc6e8f51631e89eec2df36c5636025

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
3052	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 opened for modification	C:\Windows\lsass	lsass
File created	C:\Windows\lsass	sihost.exe
File opened for modification	C:\Windows\lsass	sihost.exe

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
2856	schtasks.exe
2828	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1680	sihost.exe
Token: SeDebugPrivilege	3052	lsass
Token: SeIncBasePriorityPrivilege	3052	lsass

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1680 wrote to memory of 2340	1680	sihost.exe	31
PID 1680 wrote to memory of 2340	1680	sihost.exe	31
PID 1680 wrote to memory of 2340	1680	sihost.exe	31
PID 1680 wrote to memory of 2244	1680	sihost.exe	32
PID 1680 wrote to memory of 2244	1680	sihost.exe	32
PID 1680 wrote to memory of 2244	1680	sihost.exe	32
PID 2244 wrote to memory of 2856	2244	cmd.exe	35
PID 2244 wrote to memory of 2856	2244	cmd.exe	35
PID 2244 wrote to memory of 2856	2244	cmd.exe	35
PID 1680 wrote to memory of 2744	1680	sihost.exe	36
PID 1680 wrote to memory of 2744	1680	sihost.exe	36
PID 1680 wrote to memory of 2744	1680	sihost.exe	36
PID 2744 wrote to memory of 2828	2744	cmd.exe	38
PID 2744 wrote to memory of 2828	2744	cmd.exe	38
PID 2744 wrote to memory of 2828	2744	cmd.exe	38
PID 2680 wrote to memory of 3052	2680	taskeng.exe	41
PID 2680 wrote to memory of 3052	2680	taskeng.exe	41
PID 2680 wrote to memory of 3052	2680	taskeng.exe	41

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:1680
- 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:2340
- 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:2244
- - 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:2856
- 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:2744
- - 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:2828

C:\Windows\system32\taskeng.exe
taskeng.exe {7D94EEB4-0AC1-4E96-96EC-B00F4D25342F} S-1-5-21-4177215427-74451935-3209572229-1000:JSMURNPT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2680
- C:\Windows\lsass
  C:\Windows\lsass
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Drops file in Windows directory
  - Suspicious use of AdjustPrivilegeToken
  PID:3052

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1680-0-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

Filesize
4KB

Download
memory/1680-1-0x000000013F3F0000-0x000000013F400000-memory.dmp

Filesize
64KB

Download
memory/3052-33-0x000000013FA20000-0x000000013FA30000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads