83c23fc5b9c23e97b79c0e8a2fafd0fe61bcb8025b77bf1f56f60f8a5f90839c

Analysis

max time kernel
151s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
29/11/2022, 13:00

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

yahooa/yahoob.class
Size

14KB
MD5

897c0fad6203d9ed63e7c65273eeabe9
SHA1

0be6107360e2ff74da262859934e324e736762c8
SHA256

a4ad2ec89c82ea910f7fd2579906d5e4d4b04344c3779c8f92844060d04b2d97
SHA512

4bebf27f4f10f52ffd9e7b3a1ad40f7b24e2f485e1064cec4e38ff7e51d3d75b127710fa6f48a84fe4bff66d965fd1cd62a408a06dbd69f71fdfe30a9fe5cc3f
SSDEEP

384:J4TVYQlL3XoG0E5/BCxH1z0lCzfMFL+XzE:+ZYQtYG0+SHZ0lCzfiK4

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-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\class_auto_file\shell\Read\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\class_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\.class	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\.class\ = "class_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\class_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\class_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\class_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000_CLASSES\class_auto_file\shell\Read	rundll32.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1816	AcroRd32.exe
1816	AcroRd32.exe
1816	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1116 wrote to memory of 2032	1116	cmd.exe	29
PID 1116 wrote to memory of 2032	1116	cmd.exe	29
PID 1116 wrote to memory of 2032	1116	cmd.exe	29
PID 2032 wrote to memory of 1816	2032	rundll32.exe	30
PID 2032 wrote to memory of 1816	2032	rundll32.exe	30
PID 2032 wrote to memory of 1816	2032	rundll32.exe	30
PID 2032 wrote to memory of 1816	2032	rundll32.exe	30

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\yahooa\yahoob.class
1⤵
- Suspicious use of WriteProcessMemory
PID:1116
- C:\Windows\system32\rundll32.exe
  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\yahooa\yahoob.class
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2032
- - 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\yahoob.class"
    3⤵
    - Suspicious use of SetWindowsHookEx
    PID:1816

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

Loading Replay Monitor...

Downloads

memory/1116-54-0x000007FEFB801000-0x000007FEFB803000-memory.dmp

Filesize
8KB

Download
memory/1816-82-0x0000000074D61000-0x0000000074D63000-memory.dmp

Filesize
8KB

Download