4175d94e4c5cde5f36f778d11d1984448cecb1bf1c3324129b2db104197d5ff0

Analysis

max time kernel
165s
max time network
176s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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\msel32.dll = "{E94CD2F8-B5D5-EAB6-F0BD-93316845B2DA}"	rundll32.exe

Executes dropped EXE 1 IoCs

pid	Process
1132	msmz.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	\??\c:\windows\SysWOW64\msel32.dll	rundll32.exe
File opened for modification	\??\c:\windows\SysWOW64\msel32.dll	rundll32.exe
File created	\??\c:\windows\SysWOW64\msmz.exe	rundll32.exe

Modifies registry class 6 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{E94CD2F8-B5D5-EAB6-F0BD-93316845B2DA}\InprocServer32\ = "c:\\windows\\SysWow64\\msel32.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{E94CD2F8-B5D5-EAB6-F0BD-93316845B2DA}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{E94CD2F8-B5D5-EAB6-F0BD-93316845B2DA}\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\{E94CD2F8-B5D5-EAB6-F0BD-93316845B2DA}	rundll32.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe
3460	rundll32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3460	rundll32.exe
Token: SeDebugPrivilege	3460	rundll32.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4448 wrote to memory of 3460	4448	rundll32.exe	94
PID 4448 wrote to memory of 3460	4448	rundll32.exe	94
PID 4448 wrote to memory of 3460	4448	rundll32.exe	94
PID 3460 wrote to memory of 1132	3460	rundll32.exe	97
PID 3460 wrote to memory of 1132	3460	rundll32.exe	97
PID 3460 wrote to memory of 1132	3460	rundll32.exe	97

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b9d9b854698cd20b6e14ce0885eb10e4.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4448
- 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
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3460
- - \??\c:\windows\SysWOW64\msmz.exe
    c:\windows\syswow64\rundll32.exe
    3⤵
    - Executes dropped EXE
    PID:1132

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4076 --field-trial-handle=2260,i,3303482231723870786,2954015409682154873,262144 --variations-seed-version /prefetch:8
1⤵
PID:4632

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

C:\Windows\SysWOW64\msmz.exe

Filesize
60KB

MD5
889b99c52a60dd49227c5e485a016679

SHA1
8fa889e456aa646a4d0a4349977430ce5fa5e2d7

SHA256
6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910

SHA512
08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641

Download Submit
memory/3460-0-0x0000000010000000-0x000000001003B000-memory.dmp

Filesize
236KB

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