6e5e09d126acb34a42d2b2d93c4eb17d5e345f728e3ac50f49c22dcdd0c422bb

Analysis

max time kernel
121s
max time network
121s
platform
windows7_x64
resource
win7-20240419-en
resource tags

arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
submitted
30-05-2024 21:41

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General

Target

cstealer.pyc
Size

39KB
MD5

859d53b651327931b647406b22a76e60
SHA1

128ed3b3f2d4ff3e3ce4562b4d6dd19e01008414
SHA256

c069a156ac0ad7c0fddb43a28fcc7cf8b09b07c0ce1fb6de8648e399e206debb
SHA512

b6b8fe39a3bc66dc10c8c56b12a47ee5b2e46241d80004cc928dc983a8ae9dd1fa855eb16cae061fec9fac425b3c01039269b40710d8d1e206b0782ba5649140
SSDEEP

768:fuAF/lvck17WnMGF+5JsylM3jprKBBbxoZUM4PqVfqrY9Wygqxie3HrKl4HYiBe/:x/ukW0JsyC3F6OUM6qVirY9WygWiMujf

Score

3^/10

Malware Config

Signatures

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

System Information Discovery
T1082

Modifies registry class 9 IoCs

Processes:

rundll32.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\pyc_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\.pyc	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\pyc_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\pyc_auto_file\shell\Read\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\pyc_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\.pyc\ = "pyc_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\pyc_auto_file\shell\Read	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000_CLASSES\pyc_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

AcroRd32.exe

pid process

2600 AcroRd32.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

AcroRd32.exe

pid process

2600 AcroRd32.exe
2600 AcroRd32.exe

pid	process
2600	AcroRd32.exe

pid	process
2600	AcroRd32.exe
2600	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

cmd.exerundll32.exe

description	pid	process	target process
PID 2084 wrote to memory of 2676	2084	cmd.exe	rundll32.exe
PID 2084 wrote to memory of 2676	2084	cmd.exe	rundll32.exe
PID 2084 wrote to memory of 2676	2084	cmd.exe	rundll32.exe
PID 2676 wrote to memory of 2600	2676	rundll32.exe	AcroRd32.exe
PID 2676 wrote to memory of 2600	2676	rundll32.exe	AcroRd32.exe
PID 2676 wrote to memory of 2600	2676	rundll32.exe	AcroRd32.exe
PID 2676 wrote to memory of 2600	2676	rundll32.exe	AcroRd32.exe

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\cstealer.pyc
1⤵
- Suspicious use of WriteProcessMemory
PID:2084

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\cstealer.pyc
2⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2676

C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe
"C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\cstealer.pyc"
3⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:2600

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Adobe\Acrobat\9.0\SharedDataEvents
Filesize
3KB

MD5
3a41ca2be38befc6eb0470acd4351d73

SHA1
78b5c0fec489e8a24c9e947c3a699c95195a7614

SHA256
1de4740501abbca411a6bef7eceeba81c3080ab46e9bcdd379d25e9731e0d624

SHA512
56347ad55bc3cd6df603b3ac42883c58a0ef94a3c304cbc9160f827b999ab860e3f457b15aa53226a4e13d31ded27095e445aefbf41ac13e30d547574f2949c0

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