fbb40094f45878374ef62cee6e3e66f3e36922a59ab088a6b3a0b0b50974cd1f

Analysis

max time kernel
40s
max time network
17s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
07-05-2024 15:58

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General

Target

cstealer.pyc
Size

67KB
MD5

0c4b586ef1fcd659b9f5e43380ef3eec
SHA1

d2d32414f544d971e3b0b27e5fbbe1bb07298456
SHA256

ec0ef077ec2759101d51a999a1bcd76e13dd648ce0f523370cf176609f22208d
SHA512

cf3f8e511f39a86314f4814d5813dfc8058ef158d96556d1bb573cfd5807c5adbde9cf91ec5ce7df83407b7d9c374b4663ec2ee9c4a6c5384a9c5a350ddaa71c
SSDEEP

1536:l0xqOgTxpqBJlMstbo88jLQQcXf9qS0Vr+LRheG:lqw/+bo88PiXX0r+LRP

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
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\pyc_auto_file	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\pyc_auto_file\shell\Read	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\pyc_auto_file\shell\Read\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\pyc_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_Classes\Local Settings	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\pyc_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\.pyc	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\.pyc\ = "pyc_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\pyc_auto_file\shell	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

AcroRd32.exe

pid process

2436 AcroRd32.exe
2436 AcroRd32.exe

pid	process
2436	AcroRd32.exe
2436	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

cmd.exerundll32.exe

description	pid	process	target process
PID 2008 wrote to memory of 2468	2008	cmd.exe	rundll32.exe
PID 2008 wrote to memory of 2468	2008	cmd.exe	rundll32.exe
PID 2008 wrote to memory of 2468	2008	cmd.exe	rundll32.exe
PID 2468 wrote to memory of 2436	2468	rundll32.exe	AcroRd32.exe
PID 2468 wrote to memory of 2436	2468	rundll32.exe	AcroRd32.exe
PID 2468 wrote to memory of 2436	2468	rundll32.exe	AcroRd32.exe
PID 2468 wrote to memory of 2436	2468	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:2008

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:2468

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 use of SetWindowsHookEx
PID:2436

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
9ab6766b0a7e7e16f236b4db10bfa7db

SHA1
15fd98789485b7f0b4f39bf52c8dca3d09281622

SHA256
5ff088b5a40d3484471450604fcc6f1afec1794a6fb2c0ce73feddd41f4f0aec

SHA512
5e5d4eb7a7d1f06fa7ea567d9e8a605f4870f67c46c4cfe52c76348e5cff30e0d6752244be34e8aff5693d2877df185fb4b3a85041f305c61c5d226495d5a653

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