wshrat | 5684eaf9be940a6d7c5a559182c8d54b46151de46c72b60bf1c1112e2aeb9e4b

Analysis

max time kernel
149s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
22-05-2023 18:20

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General

Target

00912938pdf.js
Size

187KB
MD5

36c7ea69a51fdcb7eb3b66eafbbcf516
SHA1

8a81452869a67d8abfe5f2165b3475286274139e
SHA256

5684eaf9be940a6d7c5a559182c8d54b46151de46c72b60bf1c1112e2aeb9e4b
SHA512

2c99f20c1b4c2796501c03ea78d6704efab1fda7e4356d35797e1ac853dd7b0cff6378d6af5250f65daa855bb46591d5902b6cab3332501c24faba018c7ac4f3
SSDEEP

3072:nrVZAmAl1luVkQS7bURCwbIpklgVDSxGfmuZrvEzs8ZPr+eGK/68Q0bamqg:rVZAmAl1luVkQS8RCuAklgF2GuuZTXe7

Score

10^/10

wshrat persistence trojan

Malware Config

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/0x000c000000023148-138.dat	family_wshrat

Blocklisted process makes network request 20 IoCs

flow	pid	Process
6	4604	wscript.exe
8	4604	wscript.exe
21	4604	wscript.exe
33	4604	wscript.exe
41	4604	wscript.exe
42	4604	wscript.exe
49	4604	wscript.exe
59	4604	wscript.exe
62	4604	wscript.exe
63	4604	wscript.exe
64	4604	wscript.exe
66	4604	wscript.exe
67	4604	wscript.exe
68	4604	wscript.exe
69	4604	wscript.exe
70	4604	wscript.exe
71	4604	wscript.exe
72	4604	wscript.exe
73	4604	wscript.exe
74	4604	wscript.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\00912938pdf.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\00912938pdf.js	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-1-5-21-1013461898-3711306144-4198452673-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1013461898-3711306144-4198452673-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\00912938pdf = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Local\\Temp\\00912938pdf.js\""	wscript.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\00912938pdf = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Local\\Temp\\00912938pdf.js\""	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
5	ip-api.com

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

System Information Discovery
T1082

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\00912938pdf.js
1⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
PID:4604

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\00912938pdf.js

Filesize
187KB

MD5
36c7ea69a51fdcb7eb3b66eafbbcf516

SHA1
8a81452869a67d8abfe5f2165b3475286274139e

SHA256
5684eaf9be940a6d7c5a559182c8d54b46151de46c72b60bf1c1112e2aeb9e4b

SHA512
2c99f20c1b4c2796501c03ea78d6704efab1fda7e4356d35797e1ac853dd7b0cff6378d6af5250f65daa855bb46591d5902b6cab3332501c24faba018c7ac4f3

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