c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172

Analysis

max time kernel
155s
max time network
157s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
19/09/2022, 06:52

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General

Target

c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe
Size

80KB
MD5

6d9e05e3e63db2531a925485400b838e
SHA1

6ee095efccef861d9aba26eab88b5e9c00aa7f44
SHA256

c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172
SHA512

2a63a9e53b275e096150deffbe651a2b64d68fe7fb113e20f68c9b423cb7f143e360f28e579a2668452cd67249a7fb2f79c789b950c41a66de65847a90982c70
SSDEEP

1536:PY5kn+CN1iFitlQtzyduatxlZqU6y/8XFHbh:PWvCN1iF/2ZFPN8XF7h

Score

8^/10

persistence

Malware Config

Signatures

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\explorer\run	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\WinDrv = "C:\\Windows\\system32\\ratserver.exe"	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe

Executes dropped EXE 1 IoCs

pid	Process
3588	ratserver.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\ratserver.exe	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe
File opened for modification	C:\Windows\SysWOW64\ratserver.exe	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe
File opened for modification	C:\Windows\SysWOW64\ratserver.Exe	ratserver.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
404	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe
3588	ratserver.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 404 wrote to memory of 3588	404	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe	84
PID 404 wrote to memory of 3588	404	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe	84
PID 404 wrote to memory of 3588	404	c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe	84

C:\Users\Admin\AppData\Local\Temp\c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe
"C:\Users\Admin\AppData\Local\Temp\c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172.exe"
1⤵
- Adds policy Run key to start application
- Checks computer location settings
- Drops file in System32 directory
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:404
- C:\Windows\SysWOW64\ratserver.exe
  "C:\Windows\system32\ratserver.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of SetWindowsHookEx
  PID:3588

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\ratserver.exe

Filesize
80KB

MD5
6d9e05e3e63db2531a925485400b838e

SHA1
6ee095efccef861d9aba26eab88b5e9c00aa7f44

SHA256
c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172

SHA512
2a63a9e53b275e096150deffbe651a2b64d68fe7fb113e20f68c9b423cb7f143e360f28e579a2668452cd67249a7fb2f79c789b950c41a66de65847a90982c70

Download Submit
C:\Windows\SysWOW64\ratserver.exe

Filesize
80KB

MD5
6d9e05e3e63db2531a925485400b838e

SHA1
6ee095efccef861d9aba26eab88b5e9c00aa7f44

SHA256
c1b85acbe02ab03ea2771a37e628f13c12a69698b3bf16a35c4e4fcbb8e9b172

SHA512
2a63a9e53b275e096150deffbe651a2b64d68fe7fb113e20f68c9b423cb7f143e360f28e579a2668452cd67249a7fb2f79c789b950c41a66de65847a90982c70

Download Submit