4175d94e4c5cde5f36f778d11d1984448cecb1bf1c3324129b2db104197d5ff0

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
07/03/2024, 22:43

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General

Target

b9d9b854698cd20b6e14ce0885eb10e4.dll
Size

59KB
MD5

b9d9b854698cd20b6e14ce0885eb10e4
SHA1

e7811a1f7e9b8972afd14e2a7747bf189c692bce
SHA256

4175d94e4c5cde5f36f778d11d1984448cecb1bf1c3324129b2db104197d5ff0
SHA512

5bb86a27a1cc3fabd12d1e762f99bd5212dd581df92b779230807b64fe8f96d66d686e7666cbed9535219b4adacf293c0b3fb26545784182137f658209cb5df1
SSDEEP

1536:dPF2M4Tm19+jND9H+Pj/Znh+ao99mpdES45:dd2M4GoNh+TZXoSPEf5

Score

10^/10

persistence

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\mswo32.dll = "{1E1DEDD0-78C0-D31B-96E6-2B04228D9602}"	rundll32.exe

Executes dropped EXE 1 IoCs

pid	Process
2796	msyr.exe

Loads dropped DLL 1 IoCs

pid	Process
1248	rundll32.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	\??\c:\windows\SysWOW64\mswo32.dll	rundll32.exe
File opened for modification	\??\c:\windows\SysWOW64\mswo32.dll	rundll32.exe
File created	\??\c:\windows\SysWOW64\msyr.exe	rundll32.exe

Modifies registry class 6 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{1E1DEDD0-78C0-D31B-96E6-2B04228D9602}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{1E1DEDD0-78C0-D31B-96E6-2B04228D9602}\InprocServer32	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{1E1DEDD0-78C0-D31B-96E6-2B04228D9602}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{1E1DEDD0-78C0-D31B-96E6-2B04228D9602}\InprocServer32\ = "c:\\windows\\SysWow64\\mswo32.dll"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1248	rundll32.exe
1248	rundll32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1248	rundll32.exe
Token: SeDebugPrivilege	1248	rundll32.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2368 wrote to memory of 1248	2368	rundll32.exe	28
PID 2368 wrote to memory of 1248	2368	rundll32.exe	28
PID 2368 wrote to memory of 1248	2368	rundll32.exe	28
PID 2368 wrote to memory of 1248	2368	rundll32.exe	28
PID 2368 wrote to memory of 1248	2368	rundll32.exe	28
PID 2368 wrote to memory of 1248	2368	rundll32.exe	28
PID 2368 wrote to memory of 1248	2368	rundll32.exe	28
PID 1248 wrote to memory of 2796	1248	rundll32.exe	29
PID 1248 wrote to memory of 2796	1248	rundll32.exe	29
PID 1248 wrote to memory of 2796	1248	rundll32.exe	29
PID 1248 wrote to memory of 2796	1248	rundll32.exe	29

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b9d9b854698cd20b6e14ce0885eb10e4.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2368
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b9d9b854698cd20b6e14ce0885eb10e4.dll,#1
  2⤵
  - Adds autorun key to be loaded by Explorer.exe on startup
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1248
- - \??\c:\windows\SysWOW64\msyr.exe
    c:\windows\syswow64\rundll32.exe
    3⤵
    - Executes dropped EXE
    PID:2796

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Windows\SysWOW64\msyr.exe

Filesize
43KB

MD5
51138beea3e2c21ec44d0932c71762a8

SHA1
8939cf35447b22dd2c6e6f443446acc1bf986d58

SHA256
5ad3c37e6f2b9db3ee8b5aeedc474645de90c66e3d95f8620c48102f1eba4124

SHA512
794f30fe452117ff2a26dc9d7086aaf82b639c2632ac2e381a81f5239caaec7c96922ba5d2d90bfd8d74f0a6cd4f79fbda63e14c6b779e5cf6834c13e4e45e7d

Download Submit
memory/1248-0-0x0000000010000000-0x000000001003B000-memory.dmp

Filesize
236KB

Download
memory/1248-1-0x0000000010000000-0x000000001003B000-memory.dmp

Filesize
236KB

Download
memory/1248-2-0x0000000010000000-0x000000001003B000-memory.dmp

Filesize
236KB

Download
memory/1248-5-0x0000000010000000-0x000000001003B000-memory.dmp

Filesize
236KB

Download