58b5c71cb21b0c9327216aff93feed72365921d396e21eab0f2413a84fdd833f

Analysis

max time kernel
152s
max time network
44s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
01/10/2022, 23:22

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General

Target

MyBuff.class
Size

765B
MD5

7f33ddd1912429434bdb0619d6ff8b54
SHA1

3289827a712a404d9148ce5fca16f999c6425025
SHA256

48b94246fd9413e59ef420234732eb84b7d966ef4a17c8a67467a56996ce682d
SHA512

034cbe8977a694659eb95beec9e1e9cf0f71b3633b3c67e36ff8361f2e5a752a0f0880c6fc58d7c343b9f27ed8e36cff2ebd4035916c8cdbcba549f14e3f79ac

Score

3^/10

Malware Config

Signatures

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

System Information Discovery
T1082

Modifies registry class 10 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\class_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\.class\ = "class_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\class_auto_file\shell\Read	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\class_auto_file\shell\Read\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\class_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\.class	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\class_auto_file\shell	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000_CLASSES\class_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1984	AcroRd32.exe
1984	AcroRd32.exe
1984	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1424 wrote to memory of 1484	1424	cmd.exe	27
PID 1424 wrote to memory of 1484	1424	cmd.exe	27
PID 1424 wrote to memory of 1484	1424	cmd.exe	27
PID 1484 wrote to memory of 1984	1484	rundll32.exe	28
PID 1484 wrote to memory of 1984	1484	rundll32.exe	28
PID 1484 wrote to memory of 1984	1484	rundll32.exe	28
PID 1484 wrote to memory of 1984	1484	rundll32.exe	28

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\MyBuff.class
1⤵
- Suspicious use of WriteProcessMemory
PID:1424
- C:\Windows\system32\rundll32.exe
  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\MyBuff.class
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1484
- - 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\MyBuff.class"
    3⤵
    - Suspicious use of SetWindowsHookEx
    PID:1984

Network

MITRE ATT&CK Enterprise v6

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

memory/1424-54-0x000007FEFBD11000-0x000007FEFBD13000-memory.dmp

Filesize
8KB

Download
memory/1984-82-0x0000000076151000-0x0000000076153000-memory.dmp

Filesize
8KB

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