wshrat | 5684eaf9be940a6d7c5a559182c8d54b46151de46c72b60bf1c1112e2aeb9e4b

Analysis

max time kernel
144s
max time network
148s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-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
behavioral1/files/0x000b0000000122c7-59.dat	family_wshrat

Blocklisted process makes network request 21 IoCs

flow	pid	Process
4	1984	wscript.exe
6	1984	wscript.exe
7	1984	wscript.exe
8	1984	wscript.exe
11	1984	wscript.exe
12	1984	wscript.exe
13	1984	wscript.exe
15	1984	wscript.exe
16	1984	wscript.exe
17	1984	wscript.exe
19	1984	wscript.exe
20	1984	wscript.exe
21	1984	wscript.exe
23	1984	wscript.exe
24	1984	wscript.exe
25	1984	wscript.exe
27	1984	wscript.exe
28	1984	wscript.exe
29	1984	wscript.exe
31	1984	wscript.exe
32	1984	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
Set value (str)	\REGISTRY\USER\S-1-5-21-3948302646-268491222-1934009652-1000\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
Key created	\REGISTRY\USER\S-1-5-21-3948302646-268491222-1934009652-1000\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
3	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:1984

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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