945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df

Analysis

max time kernel
190s
max time network
235s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
06/12/2022, 19:56

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General

Target

945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
Size

92KB
MD5

393960c2c598a83ef832de5714a17040
SHA1

9feede770e26e04c9a855594be119478d80770c3
SHA256

945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df
SHA512

4d9f050308d3bd11ecfc48f9c213ac5b17d24511a641b9e9e37fed2397ed21ddce11955a77092fbd3c5cfdf3c55987bdd86a4361398c134a24640d0b36e99999
SSDEEP

1536:mFNpf0zlG05TKliZ3lEzLN10CoW5Igq8dClT5gkICL0UPlv:CSJ5uUcRulWNElgkIhUPlv

Score

8^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
3636	winmgrsv.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-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe

Drops file in System32 directory 8 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\winmgrsv.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
File opened for modification	C:\Windows\SysWOW64\rscest32.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
File created	C:\Windows\SysWOW64\rscest32.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
File opened for modification	C:\Windows\SysWOW64\dffvismd.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
File created	C:\Windows\SysWOW64\dffvismd.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
File opened for modification	C:\Windows\SysWOW64\kstenbin.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
File created	C:\Windows\SysWOW64\kstenbin.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
File opened for modification	C:\Windows\SysWOW64\winmgrsv.exe	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.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 3 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 3636	4368	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe	83
PID 4368 wrote to memory of 3636	4368	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe	83
PID 4368 wrote to memory of 3636	4368	945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe	83

C:\Users\Admin\AppData\Local\Temp\945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe
"C:\Users\Admin\AppData\Local\Temp\945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df.exe"
1⤵
- Checks computer location settings
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:4368
- C:\Windows\SysWOW64\winmgrsv.exe
  "C:\Windows\System32\winmgrsv.exe" a
  2⤵
  - Executes dropped EXE
  PID:3636

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

Replay Monitor

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Downloads

C:\Windows\SysWOW64\dffvismd.exe

Filesize
92KB

MD5
393960c2c598a83ef832de5714a17040

SHA1
9feede770e26e04c9a855594be119478d80770c3

SHA256
945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df

SHA512
4d9f050308d3bd11ecfc48f9c213ac5b17d24511a641b9e9e37fed2397ed21ddce11955a77092fbd3c5cfdf3c55987bdd86a4361398c134a24640d0b36e99999

Download Submit
C:\Windows\SysWOW64\kstenbin.exe

Filesize
92KB

MD5
393960c2c598a83ef832de5714a17040

SHA1
9feede770e26e04c9a855594be119478d80770c3

SHA256
945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df

SHA512
4d9f050308d3bd11ecfc48f9c213ac5b17d24511a641b9e9e37fed2397ed21ddce11955a77092fbd3c5cfdf3c55987bdd86a4361398c134a24640d0b36e99999

Download Submit
C:\Windows\SysWOW64\rscest32.exe

Filesize
92KB

MD5
393960c2c598a83ef832de5714a17040

SHA1
9feede770e26e04c9a855594be119478d80770c3

SHA256
945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df

SHA512
4d9f050308d3bd11ecfc48f9c213ac5b17d24511a641b9e9e37fed2397ed21ddce11955a77092fbd3c5cfdf3c55987bdd86a4361398c134a24640d0b36e99999

Download Submit
C:\Windows\SysWOW64\winmgrsv.exe

Filesize
92KB

MD5
393960c2c598a83ef832de5714a17040

SHA1
9feede770e26e04c9a855594be119478d80770c3

SHA256
945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df

SHA512
4d9f050308d3bd11ecfc48f9c213ac5b17d24511a641b9e9e37fed2397ed21ddce11955a77092fbd3c5cfdf3c55987bdd86a4361398c134a24640d0b36e99999

Download Submit
C:\Windows\SysWOW64\winmgrsv.exe

Filesize
92KB

MD5
393960c2c598a83ef832de5714a17040

SHA1
9feede770e26e04c9a855594be119478d80770c3

SHA256
945fcd0aae41b3701e5d882a5a90e3c4e3ca5cfb8969a00adbf5495671f019df

SHA512
4d9f050308d3bd11ecfc48f9c213ac5b17d24511a641b9e9e37fed2397ed21ddce11955a77092fbd3c5cfdf3c55987bdd86a4361398c134a24640d0b36e99999

Download Submit