c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35

Analysis

max time kernel
145s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
23-11-2022 15:58

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General

Target

c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe
Size

500KB
MD5

3bc54aa712dcd5dd9db8616360baa451
SHA1

5a9b56b1e19013fbee4c405702fc982db92c16b2
SHA256

c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35
SHA512

55b07ff5a8eb536eed0ee19d96531eeba00d26d0559cb57678afcd96cc3ff5e35786d15e6d34778731f93fe192ce879297ac41aa744998ea80f07c1c96af0618
SSDEEP

6144:47X+GRJ/V7M4jrHOWxbC7aZjvqxGKm3ipTRIER0u+GIIIIIIIhIIIIIIIIIIIII4:4T+GRn7MAOObncJm5X

Score

8^/10

persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

steamwebhelper.exe

pid process

2440 steamwebhelper.exe

pid	process
2440	steamwebhelper.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

Processes:

c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exesteamwebhelper.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\Users\\Admin\\AppData\\Roaming\\steamwebhelper2\\steamwebhelper.exe"	c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\Users\\Admin\\AppData\\Roaming\\steamwebhelper2\\steamwebhelper.exe"	steamwebhelper.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exesteamwebhelper.exe

pid process

3420 c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe
2440 steamwebhelper.exe

pid	process
3420	c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe
2440	steamwebhelper.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exesteamwebhelper.exe

description	pid	process
Token: SeDebugPrivilege	3420	c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe
Token: SeDebugPrivilege	2440	steamwebhelper.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe

description	pid	process	target process
PID 3420 wrote to memory of 2440	3420	c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe	steamwebhelper.exe
PID 3420 wrote to memory of 2440	3420	c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe	steamwebhelper.exe
PID 3420 wrote to memory of 2440	3420	c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe	steamwebhelper.exe

C:\Users\Admin\AppData\Local\Temp\c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe
"C:\Users\Admin\AppData\Local\Temp\c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3420
- C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe
  "C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2440

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

C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe

Filesize
500KB

MD5
3bc54aa712dcd5dd9db8616360baa451

SHA1
5a9b56b1e19013fbee4c405702fc982db92c16b2

SHA256
c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35

SHA512
55b07ff5a8eb536eed0ee19d96531eeba00d26d0559cb57678afcd96cc3ff5e35786d15e6d34778731f93fe192ce879297ac41aa744998ea80f07c1c96af0618

Download Submit
C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe

Filesize
500KB

MD5
3bc54aa712dcd5dd9db8616360baa451

SHA1
5a9b56b1e19013fbee4c405702fc982db92c16b2

SHA256
c5f83dd66d87c927e8d25edd40a3f96c1ffbe890e87848e90ba7911f34bdcc35

SHA512
55b07ff5a8eb536eed0ee19d96531eeba00d26d0559cb57678afcd96cc3ff5e35786d15e6d34778731f93fe192ce879297ac41aa744998ea80f07c1c96af0618

Download Submit
memory/2440-136-0x0000000000000000-mapping.dmp

Download
memory/3420-132-0x0000000000AA0000-0x0000000000B22000-memory.dmp

Filesize
520KB

Download
memory/3420-133-0x0000000005FE0000-0x0000000006584000-memory.dmp

Filesize
5.6MB

Download
memory/3420-134-0x0000000005B10000-0x0000000005BA2000-memory.dmp

Filesize
584KB

Download
memory/3420-135-0x0000000005AD0000-0x0000000005ADA000-memory.dmp

Filesize
40KB

Download