83c23fc5b9c23e97b79c0e8a2fafd0fe61bcb8025b77bf1f56f60f8a5f90839c

Analysis

max time kernel
151s
max time network
46s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
29-11-2022 13:00

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General

Target

yahooa/yahooc.class
Size

5KB
MD5

abb37111170a75f7995bbe722be1ef67
SHA1

32ba585a2034a1db2b7fc00244aff8e5071f010b
SHA256

792406f8e2afeeff7b84996ee1e394c2fc2f5faf887b48b440763decf27b4107
SHA512

dc7861e96f612bb02e7bda22ee58267ba52072bef943f7a31eec29adc229b889c40a6081874a09afaac62dd4b981719bdc49256d79940f76d6ae7a261dfc54f8
SSDEEP

96:4a3plWpSC2IfvgaffddMlJmnHkfS7Wxs9UMpe93nmJpkO:XaP28ffddMlg2tK4mJ/

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-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\class_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\.class\ = "class_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\class_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\class_auto_file\shell\Read\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_Classes\Local Settings	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\class_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\.class	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_CLASSES\class_auto_file\shell\Read	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000_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
1640	AcroRd32.exe
1640	AcroRd32.exe
1640	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1324 wrote to memory of 904	1324	cmd.exe	29
PID 1324 wrote to memory of 904	1324	cmd.exe	29
PID 1324 wrote to memory of 904	1324	cmd.exe	29
PID 904 wrote to memory of 1640	904	rundll32.exe	31
PID 904 wrote to memory of 1640	904	rundll32.exe	31
PID 904 wrote to memory of 1640	904	rundll32.exe	31
PID 904 wrote to memory of 1640	904	rundll32.exe	31

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\yahooa\yahooc.class
1⤵
- Suspicious use of WriteProcessMemory
PID:1324
- C:\Windows\system32\rundll32.exe
  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\yahooa\yahooc.class
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:904
- - 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\yahooa\yahooc.class"
    3⤵
    - Suspicious use of SetWindowsHookEx
    PID:1640

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/1324-54-0x000007FEFBB31000-0x000007FEFBB33000-memory.dmp

Filesize
8KB

Download
memory/1640-82-0x0000000075F51000-0x0000000075F53000-memory.dmp

Filesize
8KB

Download