wshrat | 1e36ddf6a89595dcc254a9688efec067f1292e962d3d62e3ab4b369ab8f9caa8

General

Target
invoice.exe
Size 57KB
Sample220330-j79k3saef9
SHA256 1e36ddf6a89595dcc254a9688efec067f1292e962d3d62e3ab4b369ab8f9caa8
MD5 6402c8ed78e1f35ee9052ada85638daa
SHA1 3d548c3f7d59d6e50e46c4b0dd6b1d999930cd34
SHA512 4954c2db0b1ee5a37f39df607b5aa8555c53b4792435da2c5f6056317fe511358313f9c88be258efce947c5b3eedd8d9da835a38e200b44ee55825b5251204c6
MD5 SHA1 SHA512

Score

10^/10

wshrat persistence trojan

Malware Config

Extracted

Family

wshrat

C2

http://66.154.98.209:4498

Signatures

WSHRAT
WSHRAT is a variant of Houdini worm and has vbs and js variants.
trojan wshrat

WSHRAT Payload 1 IoCs

resource	yara_rule
behavioral2/files/0x000600000001e7d9-137.dat	family_wshrat

Blocklisted process makes network request 19 IoCs

flow	pid	Process
13	3232	wscript.exe
14	3232	wscript.exe
26	3232	wscript.exe
35	3232	wscript.exe
38	3232	wscript.exe
39	3232	wscript.exe
40	3232	wscript.exe
42	3232	wscript.exe
43	3232	wscript.exe
44	3232	wscript.exe
45	3232	wscript.exe
46	3232	wscript.exe
47	3232	wscript.exe
49	3232	wscript.exe
50	3232	wscript.exe
60	3232	wscript.exe
65	3232	wscript.exe
67	3232	wscript.exe
68	3232	wscript.exe

Downloads MZ/PE file

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-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	RegAsm.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ttuHj.vbs	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ttuHj.vbs	wscript.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ttuHj = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\ttuHj.vbs\""	wscript.exe
Key created	\REGISTRY\MACHINE\software\WOW6432Node\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ttuHj = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\ttuHj.vbs\""	wscript.exe
Key created	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\software\microsoft\windows\currentversion\run	wscript.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
12	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4084 set thread context of 2108	4084	invoice.exe	80

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 AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4084	invoice.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 4084 wrote to memory of 2108	4084	invoice.exe	80
PID 2108 wrote to memory of 3232	2108	RegAsm.exe	83
PID 2108 wrote to memory of 3232	2108	RegAsm.exe	83
PID 2108 wrote to memory of 3232	2108	RegAsm.exe	83

C:\Users\Admin\AppData\Local\Temp\invoice.exe
"C:\Users\Admin\AppData\Local\Temp\invoice.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4084
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:2108
- - C:\Windows\SysWOW64\wscript.exe
    "C:\Windows\System32\wscript.exe" C:\Users\Admin\AppData\Roaming\ttuHj.vbs
    3⤵
    - Blocklisted process makes network request
    - Drops startup file
    - Adds Run key to start application
    PID:3232

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

ttuHj.vbs

Path C:\Users\Admin\AppData\Roaming\ttuHj.vbs
Size 180KB
SHA256 50668fc047dc02bd0e19d9dae9830de7585b567b38b9075a9013370ff65a4aa7
MD5 7458d3753194722162bd8176d19b4916
SHA1 b922070c619ea1e596b51d3c14b02358613a1896
SHA512 d238cc7a4e43e0b1174323b1d1b6d59a470e3f7bf51de9ee58168086126ba583646ce82ec2d326a59b9f94ff3207c512c6eda7acdc13b52118ef3e1bcae360c6
MD5 SHA1 SHA512

Submit Download

memory/2108-135-0x00000000007B0000-0x000000000083A000-memory.dmp

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memory/4084-130-0x0000000000C40000-0x0000000000C56000-memory.dmp

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memory/4084-131-0x000000000BD60000-0x000000000C304000-memory.dmp

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memory/4084-132-0x000000000BA60000-0x000000000BAFC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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