6fdf71cc2e23c89add7da89bd3960d20f65ab166d5d3facdb739bde5950d3df2

Analysis

max time kernel
121s
max time network
126s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
13-03-2024 01:42

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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

Deletes itself 1 IoCs

pid	Process
2588	cyavznuc.exe

Executes dropped EXE 2 IoCs

pid	Process
2588	cyavznuc.exe
2580	cyavznuc.exe

Loads dropped DLL 6 IoCs

pid	Process
2196	c4a6a667d280bf58172d70b5cc2ab283.exe
2196	c4a6a667d280bf58172d70b5cc2ab283.exe
2588	cyavznuc.exe
2588	cyavznuc.exe
2588	cyavznuc.exe
2588	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}\InprocServer32	c4a6a667d280bf58172d70b5cc2ab283.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node	c4a6a667d280bf58172d70b5cc2ab283.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID	c4a6a667d280bf58172d70b5cc2ab283.exe
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

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 2196 wrote to memory of 2012	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	28
PID 2196 wrote to memory of 2012	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	28
PID 2196 wrote to memory of 2012	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	28
PID 2196 wrote to memory of 2012	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	28
PID 2196 wrote to memory of 2012	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	28
PID 2196 wrote to memory of 2012	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	28
PID 2196 wrote to memory of 2012	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	28
PID 2196 wrote to memory of 2588	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	29
PID 2196 wrote to memory of 2588	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	29
PID 2196 wrote to memory of 2588	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	29
PID 2196 wrote to memory of 2588	2196	c4a6a667d280bf58172d70b5cc2ab283.exe	29
PID 2588 wrote to memory of 2148	2588	cyavznuc.exe	30
PID 2588 wrote to memory of 2148	2588	cyavznuc.exe	30
PID 2588 wrote to memory of 2148	2588	cyavznuc.exe	30
PID 2588 wrote to memory of 2148	2588	cyavznuc.exe	30
PID 2588 wrote to memory of 2148	2588	cyavznuc.exe	30
PID 2588 wrote to memory of 2148	2588	cyavznuc.exe	30
PID 2588 wrote to memory of 2148	2588	cyavznuc.exe	30
PID 2588 wrote to memory of 2580	2588	cyavznuc.exe	31
PID 2588 wrote to memory of 2580	2588	cyavznuc.exe	31
PID 2588 wrote to memory of 2580	2588	cyavznuc.exe	31
PID 2588 wrote to memory of 2580	2588	cyavznuc.exe	31
PID 2580 wrote to memory of 2760	2580	cyavznuc.exe	32
PID 2580 wrote to memory of 2760	2580	cyavznuc.exe	32
PID 2580 wrote to memory of 2760	2580	cyavznuc.exe	32
PID 2580 wrote to memory of 2760	2580	cyavznuc.exe	32
PID 2580 wrote to memory of 2760	2580	cyavznuc.exe	32
PID 2580 wrote to memory of 2760	2580	cyavznuc.exe	32
PID 2580 wrote to memory of 2760	2580	cyavznuc.exe	32

C:\Users\Admin\AppData\Local\Temp\c4a6a667d280bf58172d70b5cc2ab283.exe
"C:\Users\Admin\AppData\Local\Temp\c4a6a667d280bf58172d70b5cc2ab283.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2196
- C:\Windows\SysWOW64\regsvr32.exe
  "C:\Windows\system32\regsvr32.exe" C:\Windows\system32\SafeSearch.dll /u /s
  2⤵
  PID:2012
- C:\windows\SysWOW64\cyavznuc.exe
  "C:\windows\system32\cyavznuc.exe" -kill c:\users\admin\appdata\local\temp\c4a6a667d280bf58172d70b5cc2ab283.exe /install
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Loads dropped DLL
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2588
- - C:\Windows\SysWOW64\regsvr32.exe
    "C:\Windows\system32\regsvr32.exe" C:\Windows\system32\SafeSearch.dll /u /s
    3⤵
    PID:2148
- - C:\windows\SysWOW64\cyavznuc.exe
    "C:\windows\system32\cyavznuc.exe" -kill c:\windows\syswow64\cyavznuc.exe /install /install
    3⤵
    - Executes dropped EXE
    - Modifies registry class
    - Suspicious use of WriteProcessMemory
    PID:2580
  - - C:\Windows\SysWOW64\regsvr32.exe
      "C:\Windows\system32\regsvr32.exe" C:\Windows\system32\SafeSearch.dll /u /s
      4⤵
      PID:2760

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

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Downloads

\Windows\SysWOW64\cyavznuc.exe

Filesize
104KB

MD5
c4a6a667d280bf58172d70b5cc2ab283

SHA1
591be136c30f6141ca137fb5259fc0d1e1e8c956

SHA256
6fdf71cc2e23c89add7da89bd3960d20f65ab166d5d3facdb739bde5950d3df2

SHA512
2e2dc85a4c4e6a61a1d666d23d1aec9244725e83a25d960fc641acf65e8ce2e51402791bc2af74c697472b1a3f852e371a0a4de955013d04dc90c3d04355705b

Download Submit
memory/2196-0-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/2196-10-0x0000000002420000-0x000000000243A000-memory.dmp

Filesize
104KB

Download
memory/2196-11-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/2580-19-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/2588-12-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download