a8cb1f70c6f69f6120c2f4e47b5658cca9a27b3fffdc7cbe1056e6ab93383c81

General

Target

admin.exe
Size

342KB
MD5

6f57a433dc928532f94273e509e1e165
SHA1

4f9193706a8c0276af4c92b7a86d3c7bb04fd4f0
SHA256

a8cb1f70c6f69f6120c2f4e47b5658cca9a27b3fffdc7cbe1056e6ab93383c81
SHA512

6867c52c74bbbe5dd98895f7923bd1c7d7056bb76efe5fcc49c347a7f7ef7ad517178ded20bcfbb9f6b60be591508bbe27ad6db0fcc61c0cbafafab639e9dbd3
SSDEEP

6144:evHh6j8vEoadosWFRLl0cavPTck2tYI26qIPDpS/Lbg3ZKtPNO:ePJERdoVFYcIT/826qIPDpS/3gktFO

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 3 IoCs

pid	Process
5556	Windows Updater.exe
3504	Windows Updater.exe
280	Windows Updater.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2873637269-1458872900-2373203793-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Update Client = "\"C:\\Program Files (x86)\\WindowsUpdateSettings\\Windows Updater.exe\""	Windows Updater.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

Drops autorun.inf file 1 TTPs 2 IoCs

Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media

T1091

description	ioc	Process
File created	C:\autorun.inf	Windows Updater.exe
File created	F:\autorun.inf	Windows Updater.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\WindowsUpdateSettings	Windows Updater.exe
File created	C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe	admin.exe
File opened for modification	C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe	admin.exe
File opened for modification	C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe	Windows Updater.exe

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 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2420	schtasks.exe
3088	schtasks.exe
2312	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1260	admin.exe
1260	admin.exe
1260	admin.exe
1260	admin.exe
1260	admin.exe
5556	Windows Updater.exe
5556	Windows Updater.exe
5556	Windows Updater.exe
5556	Windows Updater.exe
5556	Windows Updater.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1260	admin.exe
Token: SeDebugPrivilege	5556	Windows Updater.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5556	Windows Updater.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1260 wrote to memory of 2420	1260	admin.exe	84
PID 1260 wrote to memory of 2420	1260	admin.exe	84
PID 1260 wrote to memory of 5556	1260	admin.exe	86
PID 1260 wrote to memory of 5556	1260	admin.exe	86
PID 5556 wrote to memory of 3088	5556	Windows Updater.exe	87
PID 5556 wrote to memory of 3088	5556	Windows Updater.exe	87
PID 5556 wrote to memory of 2312	5556	Windows Updater.exe	89
PID 5556 wrote to memory of 2312	5556	Windows Updater.exe	89
PID 5208 wrote to memory of 3504	5208	cmd.exe	93
PID 5208 wrote to memory of 3504	5208	cmd.exe	93

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\admin.exe
"C:\Users\Admin\AppData\Local\Temp\admin.exe"
1⤵
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1260
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Update Client" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\admin.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2420
- C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe
  "C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops autorun.inf file
  - Drops file in Program Files directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5556
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Update Client" /sc ONLOGON /tr "C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3088
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /tn "WINDOWSSYSTEMHOST" /tr "C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe" /sc MINUTE /MO 1
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2312

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:5208
- C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe
  "C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe"
  2⤵
  - Executes dropped EXE
  PID:3504

C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe
"C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe"
1⤵
- Executes dropped EXE
PID:280

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Replication Through Removable Media

1

T1091

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Replication Through Removable Media

1

T1091

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files (x86)\WindowsUpdateSettings\Windows Updater.exe

Filesize
342KB

MD5
6f57a433dc928532f94273e509e1e165

SHA1
4f9193706a8c0276af4c92b7a86d3c7bb04fd4f0

SHA256
a8cb1f70c6f69f6120c2f4e47b5658cca9a27b3fffdc7cbe1056e6ab93383c81

SHA512
6867c52c74bbbe5dd98895f7923bd1c7d7056bb76efe5fcc49c347a7f7ef7ad517178ded20bcfbb9f6b60be591508bbe27ad6db0fcc61c0cbafafab639e9dbd3

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Windows Updater.exe.log

Filesize
1KB

MD5
b6bf5ee5b8c4b2213314f35f7fb37370

SHA1
bd6f37ddde78bd653de9512794c10c67f56e0d21

SHA256
7c2bfef1734ad9c2664d35871fe4f07d5376aac17cc262ddf1f22e098d10d1f6

SHA512
d1b0914c56c586fbc86c19c0fa8926f4cca98cad8cf9ec43a2e2dab22566fb39a349d98aff0584bf106251966efcb454f0492b832ee60a60b8b800f8d85dbfb6

Download Submit
memory/1260-0-0x00007FFA76543000-0x00007FFA76545000-memory.dmp

Filesize
8KB

Download
memory/1260-1-0x0000000000670000-0x0000000000678000-memory.dmp

Filesize
32KB

Download
memory/1260-2-0x000000001B2F0000-0x000000001B38E000-memory.dmp

Filesize
632KB

Download
memory/1260-3-0x00007FFA76540000-0x00007FFA77002000-memory.dmp

Filesize
10.8MB

Download
memory/1260-4-0x0000000001000000-0x0000000001012000-memory.dmp

Filesize
72KB

Download
memory/1260-5-0x00000000010A0000-0x00000000010DC000-memory.dmp

Filesize
240KB

Download
memory/1260-14-0x00007FFA76540000-0x00007FFA77002000-memory.dmp

Filesize
10.8MB

Download
memory/5556-12-0x00007FFA76540000-0x00007FFA77002000-memory.dmp

Filesize
10.8MB

Download
memory/5556-13-0x00007FFA76540000-0x00007FFA77002000-memory.dmp

Filesize
10.8MB

Download
memory/5556-22-0x00007FFA76540000-0x00007FFA77002000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads