c328ee0d8c7308d2612122290e81b13f7d1d52e22d5f221a49328a03f56c6449

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
15-03-2024 18:01

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General

Target

cstealer.pyc
Size

67KB
MD5

b50ae745b0ee4b6faf241c63026d466b
SHA1

9f1bbcaaf529d3c77e05e45ed925466f12f5eafa
SHA256

673af425d467ab4b0fe785ce126de885dc85aa095a7239023ad9a9d32a560beb
SHA512

0f7f39683d3189474dd728cdc6b959e069f634ea3667e0b9f2e436577b2d410d0b2604526fc055e05802d177791da03485cf04efdaf832221882356ec4292169
SSDEEP

1536:l0xqOgTxpqBJlMstbo88jLQQcXf9qS0Vr+LRheG:lqc/+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

description	ioc	Process
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\ = "pyc_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\pyc_auto_file\shell	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\pyc_auto_file	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
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

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2556	AcroRd32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2556	AcroRd32.exe
2556	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2952 wrote to memory of 2576	2952	cmd.exe	29
PID 2952 wrote to memory of 2576	2952	cmd.exe	29
PID 2952 wrote to memory of 2576	2952	cmd.exe	29
PID 2576 wrote to memory of 2556	2576	rundll32.exe	30
PID 2576 wrote to memory of 2556	2576	rundll32.exe	30
PID 2576 wrote to memory of 2556	2576	rundll32.exe	30
PID 2576 wrote to memory of 2556	2576	rundll32.exe	30

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\cstealer.pyc
1⤵
- Suspicious use of WriteProcessMemory
PID:2952
- 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:2576
- - 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:2556

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
1ce390ae7d07ab2138129471fbb5e0ff

SHA1
3bf5ee74eb4fd6d5f5a474b1e44656baaa999e87

SHA256
f6089d2861c4d76a6446e0b7f6e1a9e5fc37e9dad2b4230fde9f0585c7f880bc

SHA512
6a3702e889d9b37f3631a5f9b7ce321f61c2288fcf2d93474f68186dbcd47c4537e6fcdabbfe076d6b66d7c8c9db30651a70519d612467230457f02044750068

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