24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92

Analysis

max time kernel
152s
max time network
52s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
19-09-2022 11:33

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General

Target

24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
Size

2.2MB
MD5

d9e39c24bfe27325ac6880dac794f584
SHA1

21f53606ddc8b2e576c27c318fe2b6e1a1de6ae5
SHA256

24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92
SHA512

6b9d696d6dde4812e2530dfe62d3bb63b72705c8380891670300a1f36630e1f1cbf986b2571d2a3a99c049d575e8819466898414f38f5947a0ffef91115cd5c9
SSDEEP

49152:yYEuESye17TR/mDsf2sa6Ppj4Hp1bhGuz2l0EsqTkQMZD8ZUMfo7d0:yYymc4DPp4HXhfq6EsqQ5wBo7d

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "C:\\Windows\\csrss.exe"	csrss.exe

Executes dropped EXE 1 IoCs

pid	Process
1036	csrss.exe

Drops file in System32 directory 36 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\VERSION.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\ADVAPI32.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\COMCTL32.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\OLE32.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\MPR.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\OLEAUT32.DLL	csrss.exe
File created	C:\Windows\SysWOW64\COMCTL32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\SysWOW64\WSOCK32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\ADVAPI32.DLL	csrss.exe
File created	C:\Windows\SysWOW64\WINMM.DLL	csrss.exe
File created	C:\Windows\SysWOW64\OLE32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\VERSION.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\COMCTL32.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\COMCTL32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\SysWOW64\OLE32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\SysWOW64\AVICAP32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\OLE32.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\AVICAP32.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\WINMM.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\MPR.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\MPR.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\SysWOW64\WINMM.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\OLEAUT32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\AVICAP32.DLL	csrss.exe
File created	C:\Windows\SysWOW64\OLEAUT32.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\OLEAUT32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\SysWOW64\VERSION.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\WINMM.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\WSOCK32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\MPR.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\ADVAPI32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\ADVAPI32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\SysWOW64\AVICAP32.DLL	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\SysWOW64\VERSION.DLL	csrss.exe
File opened for modification	C:\Windows\SysWOW64\WSOCK32.DLL	csrss.exe
File created	C:\Windows\SysWOW64\WSOCK32.DLL	csrss.exe

Drops file in Windows directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\winlogs.dll	csrss.exe
File opened for modification	C:\Windows\csrss.exe	csrss.exe
File created	C:\Windows\winlogs.dll	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\winlogs.dll	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File created	C:\Windows\csrss.exe	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
File opened for modification	C:\Windows\csrss.exe	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe

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

System Information Discovery
T1082

Modifies registry class 8 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{00020412-0000-0000-C000-000000000046}	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID	csrss.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{00000320-0000-0000-C000-000000000046}	csrss.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node	csrss.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\Interface\{00020412-0000-0000-C000-000000000046}	csrss.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{00000320-0000-0000-C000-000000000046}	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeSystemtimePrivilege	1036	csrss.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1036	csrss.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1344 wrote to memory of 1036	1344	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe	27
PID 1344 wrote to memory of 1036	1344	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe	27
PID 1344 wrote to memory of 1036	1344	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe	27
PID 1344 wrote to memory of 1036	1344	24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe	27

C:\Users\Admin\AppData\Local\Temp\24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe
"C:\Users\Admin\AppData\Local\Temp\24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92.exe"
1⤵
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1344
- C:\Windows\csrss.exe
  "C:\Windows\csrss.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Drops file in System32 directory
  - Drops file in Windows directory
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  PID:1036

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\csrss.exe

Filesize
2.2MB

MD5
d9e39c24bfe27325ac6880dac794f584

SHA1
21f53606ddc8b2e576c27c318fe2b6e1a1de6ae5

SHA256
24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92

SHA512
6b9d696d6dde4812e2530dfe62d3bb63b72705c8380891670300a1f36630e1f1cbf986b2571d2a3a99c049d575e8819466898414f38f5947a0ffef91115cd5c9

Download Submit
C:\Windows\csrss.exe

Filesize
2.2MB

MD5
d9e39c24bfe27325ac6880dac794f584

SHA1
21f53606ddc8b2e576c27c318fe2b6e1a1de6ae5

SHA256
24f234bdcd251a6a1b67eb893a24673119b7974050ee5fb705ecede4be315b92

SHA512
6b9d696d6dde4812e2530dfe62d3bb63b72705c8380891670300a1f36630e1f1cbf986b2571d2a3a99c049d575e8819466898414f38f5947a0ffef91115cd5c9

Download Submit
C:\Windows\winlogs.dll

Filesize
133B

MD5
9e0cd8986728211ca1ed4dc6d26c9d89

SHA1
741e1cffc0cf0e0093f82ac6cef954f697c04086

SHA256
a3a27e9b98aed4d352b7a6eb368e9c0617c47e38aefae25525bb4b192fb0aae8

SHA512
be2e2dde5cba993a5638b7c27766e034e0c190b57bd8dea9323c58d7f52a969002433d55f60b366718675abfd693784a227ccad57696eeb1c8256bbea8e31795

Download Submit
memory/1036-55-0x0000000000000000-mapping.dmp

Download
memory/1036-60-0x0000000000400000-0x00000000006C2000-memory.dmp

Filesize
2.8MB

Download
memory/1036-62-0x0000000000400000-0x00000000006C2000-memory.dmp

Filesize
2.8MB

Download
memory/1344-54-0x0000000074DE1000-0x0000000074DE3000-memory.dmp

Filesize
8KB

Download
memory/1344-58-0x0000000000400000-0x00000000006C2000-memory.dmp

Filesize
2.8MB

Download