55b7d24cefb8793f271bc910bc45dcdcd007d12655a1e311f25835fcbcd8affc

Analysis

max time kernel
119s
max time network
121s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
30-04-2024 18:14

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General

Target

cstealer.pyc
Size

74KB
MD5

392426f8f5651ec9cd340f7af7e3ad6f
SHA1

eec21e830b9d7c2479f966eba77fad97339145d1
SHA256

c7710690df008491ede1b1212027c7b06293492ef9abcba911122d5c1f5d16a1
SHA512

2d10f778249a43bd30546b37bfeefd0797dc27d39dc175498a257ea37ced967e2b03e8f92d7eb5646729e6d6ea6536a0b0f3e07d6f3e3613e3c3a926eeb0386a
SSDEEP

1536:jIiOtbk+xQx0Jl1dKh2IsiORBaa0YGXPfjdWRXee:jQaTvh2IsiYOYGPfjdWRl

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

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\.pyc\ = "pyc_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_Classes\Local Settings	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\pyc_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\pyc_auto_file\shell\Read	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\pyc_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\pyc_auto_file\shell\Read\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_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-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\pyc_auto_file	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\.pyc	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2976	AcroRd32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2976	AcroRd32.exe
2976	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 808 wrote to memory of 2652	808	cmd.exe	29
PID 808 wrote to memory of 2652	808	cmd.exe	29
PID 808 wrote to memory of 2652	808	cmd.exe	29
PID 2652 wrote to memory of 2976	2652	rundll32.exe	30
PID 2652 wrote to memory of 2976	2652	rundll32.exe	30
PID 2652 wrote to memory of 2976	2652	rundll32.exe	30
PID 2652 wrote to memory of 2976	2652	rundll32.exe	30

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\cstealer.pyc
1⤵
- Suspicious use of WriteProcessMemory
PID:808
- 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:2652
- - 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:2976

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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\Adobe\Acrobat\9.0\SharedDataEvents

Filesize
3KB

MD5
46047d8837c004e6b1efc8bd0d01c304

SHA1
297c7cb19fb5f7555299d13d7f1767754e62509d

SHA256
440183e7ccdd6b2b87eba4e5a2c023bda15f6033b65b1ff6d240277796bbe4b2

SHA512
679196eece45313c74d5ca53f582b77d2d670c500b8b911b8a06f4825c0329fc1dd77d09f908ff2e737aea7ace74fe6bfefc8812eecfdea13a3087ce9f053ab7

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