f1365b27d96aee93d6ddb7d88e56cfedccfa064a0e23877207066b0239e9a49c

Analysis

max time kernel
167s
max time network
164s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
04-12-2022 11:54

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General

Target

f1365b27d96aee93d6ddb7d88e56cfedccfa064a0e23877207066b0239e9a49c.dll
Size

35KB
MD5

0493724e78412d0f414c7b8a699a7a90
SHA1

796ab0b66a20e1f72bc23dc8ba6bc70854a950d5
SHA256

f1365b27d96aee93d6ddb7d88e56cfedccfa064a0e23877207066b0239e9a49c
SHA512

67f73c2d07a41c67d35f7f057a04df09029c202e58be212c0e8422ffc6d7b205b8175c9f33438f2b76a45b673f61e52c336c83c673dc734c143423dead6f7ca8
SSDEEP

768:BzVffeW/ija+1IiBdQrrubgeattSKJDrSxhvIih666E:BzBfadQvuHbKlr4h1f

Score

8^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4328	yuns32.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	rundll32.exe

Drops startup file 3 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yuns32.exe	rundll32.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yuns32.exe	rundll32.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RCX148.tmp	rundll32.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1320 wrote to memory of 676	1320	rundll32.exe	82
PID 1320 wrote to memory of 676	1320	rundll32.exe	82
PID 1320 wrote to memory of 676	1320	rundll32.exe	82
PID 676 wrote to memory of 4328	676	rundll32.exe	83
PID 676 wrote to memory of 4328	676	rundll32.exe	83
PID 676 wrote to memory of 4328	676	rundll32.exe	83

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\f1365b27d96aee93d6ddb7d88e56cfedccfa064a0e23877207066b0239e9a49c.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1320
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\f1365b27d96aee93d6ddb7d88e56cfedccfa064a0e23877207066b0239e9a49c.dll,#1
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Suspicious use of WriteProcessMemory
  PID:676
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yuns32.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yuns32.exe"
    3⤵
    - Executes dropped EXE
    PID:4328

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yuns32.exe

Filesize
34KB

MD5
8a879f76755c2d1f02eeb78d2887342f

SHA1
7a94565ad320e6e7a8773ba9e6febaef41836452

SHA256
f4533331667ec62d0b10cfc3e073bedaa28fc7e47de6fc2f18fa5d99aefdc8a1

SHA512
94f9ba65ef4c451be972b74a29b83d9a8292940280e9d4a6b5cbe0b256d97ff196cf95bdfd4c150780f8d45dc9189a9dafdc124d7911cfb4a45155963811c37c

Download Submit
memory/676-132-0x0000000000000000-mapping.dmp

Download
memory/676-133-0x0000000000850000-0x0000000000862000-memory.dmp

Filesize
72KB

Download
memory/4328-134-0x0000000000000000-mapping.dmp

Download