4cc54c7f3d92ff0942437b5522a2f710cd8e6ad59cfbc13cc9802f6dce998e1a

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
07/03/2024, 18:42

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General

Target

b9677be932d8c91f5518d6c45c1f21e4.exe
Size

148KB
MD5

b9677be932d8c91f5518d6c45c1f21e4
SHA1

763170e1e9ec9ca356c2a1bb96f3dc53021967a0
SHA256

4cc54c7f3d92ff0942437b5522a2f710cd8e6ad59cfbc13cc9802f6dce998e1a
SHA512

b017c43b7e6ad0b88f56e5bdd4a600e57a6714e8032edca229ff6ffeef64451592048031a658256908ff61a089b02c905db9a178145002ede74e8534b6b32527
SSDEEP

1536:OHQ9HTJKqOeOgrfnc6jHTJKqOtCUg7zRkevioOaJKd2:hTJK52rU8TJK5tg7NkMiraJKd

Score

10^/10

evasion persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\smss\u00a0.exe"	b9677be932d8c91f5518d6c45c1f21e4.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe C:\\Windows\\system32\\smss\u00a0.exe"	b9677be932d8c91f5518d6c45c1f21e4.exe

Sets file to hidden 1 TTPs 2 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1564.001

pid	Process
2196	attrib.exe
4232	attrib.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\smss .exe	b9677be932d8c91f5518d6c45c1f21e4.exe
File opened for modification	C:\Windows\SysWOW64\smss .exe	b9677be932d8c91f5518d6c45c1f21e4.exe
File opened for modification	C:\Windows\SysWOW64\smss .exe	attrib.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4020	b9677be932d8c91f5518d6c45c1f21e4.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4020	b9677be932d8c91f5518d6c45c1f21e4.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4020 wrote to memory of 2196	4020	b9677be932d8c91f5518d6c45c1f21e4.exe	89
PID 4020 wrote to memory of 2196	4020	b9677be932d8c91f5518d6c45c1f21e4.exe	89
PID 4020 wrote to memory of 2196	4020	b9677be932d8c91f5518d6c45c1f21e4.exe	89
PID 4020 wrote to memory of 4232	4020	b9677be932d8c91f5518d6c45c1f21e4.exe	91
PID 4020 wrote to memory of 4232	4020	b9677be932d8c91f5518d6c45c1f21e4.exe	91
PID 4020 wrote to memory of 4232	4020	b9677be932d8c91f5518d6c45c1f21e4.exe	91

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2196	attrib.exe
4232	attrib.exe

C:\Users\Admin\AppData\Local\Temp\b9677be932d8c91f5518d6c45c1f21e4.exe
"C:\Users\Admin\AppData\Local\Temp\b9677be932d8c91f5518d6c45c1f21e4.exe"
1⤵
- Modifies WinLogon for persistence
- Drops file in System32 directory
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4020
- C:\Windows\SysWOW64\attrib.exe
  attrib d:\log +h +s
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:2196
- C:\Windows\SysWOW64\attrib.exe
  attrib C:\Windows\system32\smss .exe +h +s
  2⤵
  - Sets file to hidden
  - Drops file in System32 directory
  - Views/modifies file attributes
  PID:4232

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\smss .exe

Filesize
148KB

MD5
b9677be932d8c91f5518d6c45c1f21e4

SHA1
763170e1e9ec9ca356c2a1bb96f3dc53021967a0

SHA256
4cc54c7f3d92ff0942437b5522a2f710cd8e6ad59cfbc13cc9802f6dce998e1a

SHA512
b017c43b7e6ad0b88f56e5bdd4a600e57a6714e8032edca229ff6ffeef64451592048031a658256908ff61a089b02c905db9a178145002ede74e8534b6b32527

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads