6fdf71cc2e23c89add7da89bd3960d20f65ab166d5d3facdb739bde5950d3df2

General

Target

c4a6a667d280bf58172d70b5cc2ab283.exe
Size

104KB
MD5

c4a6a667d280bf58172d70b5cc2ab283
SHA1

591be136c30f6141ca137fb5259fc0d1e1e8c956
SHA256

6fdf71cc2e23c89add7da89bd3960d20f65ab166d5d3facdb739bde5950d3df2
SHA512

2e2dc85a4c4e6a61a1d666d23d1aec9244725e83a25d960fc641acf65e8ce2e51402791bc2af74c697472b1a3f852e371a0a4de955013d04dc90c3d04355705b
SSDEEP

1536:S6HGhwSsky22UJ826eeJo5FRfW5RWTiXJ3j++PObZJTA5:S6HGhGkckeJoFfYWTiXJ3i+AZJ

Score

7^/10

Malware Config

Signatures

Checks computer location settings 2 TTPs 3 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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	c4a6a667d280bf58172d70b5cc2ab283.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	cyavznuc.exe
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	cyavznuc.exe

Deletes itself 1 IoCs

pid	Process
3548	cyavznuc.exe

Executes dropped EXE 2 IoCs

pid	Process
3548	cyavznuc.exe
1488	cyavznuc.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	\??\c:\windows\SysWOW64\cyavznuc.exe	c4a6a667d280bf58172d70b5cc2ab283.exe
File opened for modification	\??\c:\windows\SysWOW64\cyavznuc.exe	c4a6a667d280bf58172d70b5cc2ab283.exe

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

System Information Discovery
T1082

Modifies registry class 6 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00000000-0000-0000-0000-000000000001}	c4a6a667d280bf58172d70b5cc2ab283.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00000000-0000-0000-0000-000000000001}\InprocServer32	cyavznuc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00000000-0000-0000-0000-000000000001}\InprocServer32	cyavznuc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{00000000-0000-0000-0000-000000000001}\InprocServer32	c4a6a667d280bf58172d70b5cc2ab283.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node	c4a6a667d280bf58172d70b5cc2ab283.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID	c4a6a667d280bf58172d70b5cc2ab283.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4364 wrote to memory of 1020	4364	c4a6a667d280bf58172d70b5cc2ab283.exe	88
PID 4364 wrote to memory of 1020	4364	c4a6a667d280bf58172d70b5cc2ab283.exe	88
PID 4364 wrote to memory of 1020	4364	c4a6a667d280bf58172d70b5cc2ab283.exe	88
PID 4364 wrote to memory of 3548	4364	c4a6a667d280bf58172d70b5cc2ab283.exe	89
PID 4364 wrote to memory of 3548	4364	c4a6a667d280bf58172d70b5cc2ab283.exe	89
PID 4364 wrote to memory of 3548	4364	c4a6a667d280bf58172d70b5cc2ab283.exe	89
PID 3548 wrote to memory of 404	3548	cyavznuc.exe	90
PID 3548 wrote to memory of 404	3548	cyavznuc.exe	90
PID 3548 wrote to memory of 404	3548	cyavznuc.exe	90
PID 3548 wrote to memory of 1488	3548	cyavznuc.exe	91
PID 3548 wrote to memory of 1488	3548	cyavznuc.exe	91
PID 3548 wrote to memory of 1488	3548	cyavznuc.exe	91
PID 1488 wrote to memory of 4688	1488	cyavznuc.exe	92
PID 1488 wrote to memory of 4688	1488	cyavznuc.exe	92
PID 1488 wrote to memory of 4688	1488	cyavznuc.exe	92

C:\Users\Admin\AppData\Local\Temp\c4a6a667d280bf58172d70b5cc2ab283.exe
"C:\Users\Admin\AppData\Local\Temp\c4a6a667d280bf58172d70b5cc2ab283.exe"
1⤵
- Checks computer location settings
- Drops file in System32 directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4364
- C:\Windows\SysWOW64\regsvr32.exe
  "C:\Windows\system32\regsvr32.exe" C:\Windows\system32\SafeSearch.dll /u /s
  2⤵
  PID:1020
- C:\windows\SysWOW64\cyavznuc.exe
  "C:\windows\system32\cyavznuc.exe" -kill c:\users\admin\appdata\local\temp\c4a6a667d280bf58172d70b5cc2ab283.exe /install
  2⤵
  - Checks computer location settings
  - Deletes itself
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:3548
- - C:\Windows\SysWOW64\regsvr32.exe
    "C:\Windows\system32\regsvr32.exe" C:\Windows\system32\SafeSearch.dll /u /s
    3⤵
    PID:404
- - C:\windows\SysWOW64\cyavznuc.exe
    "C:\windows\system32\cyavznuc.exe" -kill c:\windows\syswow64\cyavznuc.exe /install /install
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Modifies registry class
    - Suspicious use of WriteProcessMemory
    PID:1488
  - - C:\Windows\SysWOW64\regsvr32.exe
      "C:\Windows\system32\regsvr32.exe" C:\Windows\system32\SafeSearch.dll /u /s
      4⤵
      PID:4688

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\cyavznuc.exe

Filesize
104KB

MD5
c4a6a667d280bf58172d70b5cc2ab283

SHA1
591be136c30f6141ca137fb5259fc0d1e1e8c956

SHA256
6fdf71cc2e23c89add7da89bd3960d20f65ab166d5d3facdb739bde5950d3df2

SHA512
2e2dc85a4c4e6a61a1d666d23d1aec9244725e83a25d960fc641acf65e8ce2e51402791bc2af74c697472b1a3f852e371a0a4de955013d04dc90c3d04355705b

Download Submit
memory/3548-12-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/3548-15-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/4364-0-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/4364-13-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download

Analysis

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