wshrat | 3922ac9a1588e0d9d5946e71d95d065cc3cf64e776d792b105981e23220d096f

Analysis

max time kernel
150s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
24/10/2022, 16:51

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General

Target
44012c0ca20d332de770aef31f2cc49b.exe
Size 606KB
Sample221024-vctf6ahgbj
SHA256 3922ac9a1588e0d9d5946e71d95d065cc3cf64e776d792b105981e23220d096f
MD5 44012c0ca20d332de770aef31f2cc49b
SHA1 95fda94b60e6156e9c0b81086072b031c5414115
SHA512 e55c0629614d15589394f4fe47ad6ed3de342040c632426a1c3bf93cd24f9b3c16d8522d7a10b238166fb287c03427766afb5c992151631c6dab9a7c34432e2d
SSDEEP 12288:re3+DBTIES/VC1Qxow0/xloaTFx/qjM67jLZ/+bPb6mYG2ea3uzZ1/DjpZPQMsDc:yYIvaTfAeTkc
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

wshrat persistence trojan

Malware Config

Extracted

Family

wshrat

http://snkcyp.duckdns.org:3369

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/0x000b000000022f44-133.dat	family_wshrat

Blocklisted process makes network request 16 IoCs

flow	pid	Process
7	648	wscript.exe
9	648	wscript.exe
20	648	wscript.exe
34	648	wscript.exe
35	648	wscript.exe
38	648	wscript.exe
41	648	wscript.exe
42	648	wscript.exe
44	648	wscript.exe
45	648	wscript.exe
46	648	wscript.exe
47	648	wscript.exe
48	648	wscript.exe
49	648	wscript.exe
50	648	wscript.exe
51	648	wscript.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	44012c0ca20d332de770aef31f2cc49b.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\qwrGC.vbs	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\qwrGC.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
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\qwrGC = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\qwrGC.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\qwrGC = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Roaming\\qwrGC.vbs\""	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
6	ip-api.com

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3828	4728	WerFault.exe	79

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4728 wrote to memory of 648	4728	44012c0ca20d332de770aef31f2cc49b.exe	80
PID 4728 wrote to memory of 648	4728	44012c0ca20d332de770aef31f2cc49b.exe	80
PID 4728 wrote to memory of 648	4728	44012c0ca20d332de770aef31f2cc49b.exe	80

C:\Users\Admin\AppData\Local\Temp\44012c0ca20d332de770aef31f2cc49b.exe
"C:\Users\Admin\AppData\Local\Temp\44012c0ca20d332de770aef31f2cc49b.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4728
- C:\Windows\SysWOW64\wscript.exe
  "C:\Windows\System32\wscript.exe" "C:\Users\Admin\AppData\Roaming\qwrGC.vbs"
  2⤵
  - Blocklisted process makes network request
  - Drops startup file
  - Adds Run key to start application
  PID:648
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4728 -s 1200
  2⤵
  - Program crash
  PID:3828

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 376 -p 4728 -ip 4728
1⤵
PID:1780

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

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Downloads

qwrGC.vbs

Path C:\Users\Admin\AppData\Roaming\qwrGC.vbs
Size 180KB
SHA256 207ac97e60aeb989a14feaae8a365f5b35233ac7800f1357b325a0bd8d3bdd5c
MD5 a1455a81d58689e88a962098e27bb004
SHA1 4e756cdd328d705819da6cff1204c949110a60d2
SHA512 3fc3d504d9a72271f5cff63e645fca0ec944a7c7425f25bd75f7d900326f93288b4885686d46bf7fc612a24b55486b014f89cc31c3c25b320cc2948c704d19a2
SSDEEP 3072:dAg8xSXAmshISeWJQ0bamQvEz7ZAbURC3eGK/6xbIpklgVDSxGfmuZ1D:dAg8xSQmshISeWmM6iRC3eGKoAklgF28
MD5 SHA1 SHA512 SSDEEP

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