3c747a7bee728895fa30722a87d7273f2132a2d37cd151123a081371fb050ed3

Analysis

max time kernel
125s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
07/01/2024, 19:18

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General

Target
a13b893441316245906882cdc352f867.dll
Size 236KB
Sample240107-xz94jadbf7
SHA256 3c747a7bee728895fa30722a87d7273f2132a2d37cd151123a081371fb050ed3
MD5 a13b893441316245906882cdc352f867
SHA1 cec61ef4bdeb0cfc4926f10c41e5b53e57852107
SHA512 6b28ee95eb498567f06ff178afc2d554093e9ab4b50a418835d786d55de19b4f65151232e53ae0a4800b86b6c61445e6fdaf076c2daeeb7f360591a35764b0a7
SSDEEP 1536:Iguo2K86vta10RJQYPIHL+D5IWhxRh/Ci4ucg3/+k5ltr+DRPG8Gz7wk+cQvMu:Go256vS0RJAL+lHPKi40+66iwkD0F
MD5 SHA1 SHA512 SSDEEP

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\fgkrr = "{1a6719f2-92ef-e734-a3f0-92ef917ad8b5}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
4640	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\abfmm.dll	rundll32.exe
File created	C:\Windows\SysWOW64\stxee.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\stxee.dll	rundll32.exe
File created	C:\Windows\SysWOW64\abfmm.dll	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1a6719f2-92ef-e734-a3f0-92ef917ad8b5}\InprocServer32\ = "C:\\Windows\\SysWow64\\abfmm.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1a6719f2-92ef-e734-a3f0-92ef917ad8b5}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1a6719f2-92ef-e734-a3f0-92ef917ad8b5}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1a6719f2-92ef-e734-a3f0-92ef917ad8b5}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1a6719f2-92ef-e734-a3f0-92ef917ad8b5}\InprocServer32	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4640	rundll32.exe
4640	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4640	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4640	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1728 wrote to memory of 4640	1728	rundll32.exe	14
PID 1728 wrote to memory of 4640	1728	rundll32.exe	14
PID 1728 wrote to memory of 4640	1728	rundll32.exe	14

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a13b893441316245906882cdc352f867.dll,#1
1⤵
- 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 SetWindowsHookEx
PID:4640

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a13b893441316245906882cdc352f867.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1728

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

Replay Monitor

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Downloads

stxee.dll

Path C:\Windows\SysWOW64\stxee.dll
Size 478KB
SHA256 768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774
MD5 e99416267b61f52fa5ab994019efd359
SHA1 86d31eae707db7fe51d2556394fcf0e8e9f6b0fd
SHA512 0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae
SSDEEP 12288:HIrZjxkFh7p/y4W0fPcdZ7cae7J/XoWwsNJ6Ir:HIrZjxw9y4WSPucaeFXoWwsNJ6Ir
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/4640-7-0x00000000778A0000-0x000000007791A000-memory.dmp

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memory/4640-0-0x0000000000400000-0x0000000000444000-memory.dmp

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memory/4640-11-0x00000000778A0000-0x000000007791A000-memory.dmp

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memory/4640-10-0x0000000000400000-0x0000000000444000-memory.dmp

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