40c92384d321d4728f5f8a7e86066069313b91ed9368f0fa50a55b6ec7f72a25

Analysis

max time kernel
120s
max time network
123s
platform
windows7_x64
resource
win7-20240705-en
resource tags

arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
submitted
03-08-2024 14:33

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General

Target

KRNL-REBORN/README.md
Size

305B
MD5

8d250ce6aa236fecbc223ad289909ade
SHA1

f2ae9ba834da647eece945abe37885ce937d48b6
SHA256

2d8ecef01e25360ebe21f5dee53a017797c5e6219e5fd041027332efb690f52f
SHA512

8a346ec6f8ce14e0ce694209fed174af41f80347f8bd3c1bdb5f4e4edb1ba00bed776a9d1690bebe3776332efcf9c215de0d03c6b471e5403836e3d463214e10

Score

3^/10

discovery

Malware Config

Signatures

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

AcroRd32.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AcroRd32.exe

Modifies registry class 9 IoCs

Processes:

rundll32.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\md_auto_file	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\md_auto_file\shell\Read	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\md_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\md_auto_file\shell\Read\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\md_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\md_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\.md	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000_CLASSES\.md\ = "md_auto_file"	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

AcroRd32.exe

pid	Process
2808	AcroRd32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

AcroRd32.exe

pid	Process
2808	AcroRd32.exe
2808	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

cmd.exerundll32.exe

description	pid	Process	procid_target
PID 1708 wrote to memory of 2892	1708	cmd.exe	31
PID 1708 wrote to memory of 2892	1708	cmd.exe	31
PID 1708 wrote to memory of 2892	1708	cmd.exe	31
PID 2892 wrote to memory of 2808	2892	rundll32.exe	33
PID 2892 wrote to memory of 2808	2892	rundll32.exe	33
PID 2892 wrote to memory of 2808	2892	rundll32.exe	33
PID 2892 wrote to memory of 2808	2892	rundll32.exe	33

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\KRNL-REBORN\README.md
1⤵
- Suspicious use of WriteProcessMemory
PID:1708
- C:\Windows\system32\rundll32.exe
  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\KRNL-REBORN\README.md
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2892
- - 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\KRNL-REBORN\README.md"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    PID:2808

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Adobe\Acrobat\9.0\SharedDataEvents

Filesize
3KB

MD5
a707602a14d5bd9b5af12694157a2355

SHA1
067c4dee5fe450e557e0bb59d4dc22b6379dadaf

SHA256
53c63b17764ca3aa21cf9daff4cdbbc28c45d2cb9415ca0724f93c2fbc908e39

SHA512
1556dd9463e66a67b70b1c2b4ec08d4b27fe58dae8e60b4a6f9ef24d53b885261bafe4feba1a7377b3a2e9b520a4d27b1a0c2b79a2245d154a24eb7146165295

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