e4bb2247f4336a3f35df56cd564c7c66cef79414e3b82c3f6688431fb224099a

Analysis

max time kernel
146s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
24-12-2023 14:45

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General

Target

0207350b914401ce4d3f28b11014a761.dll
Size

240KB
MD5

0207350b914401ce4d3f28b11014a761
SHA1

08240b0585f3307b1d6775187abac8165a5e62ca
SHA256

e4bb2247f4336a3f35df56cd564c7c66cef79414e3b82c3f6688431fb224099a
SHA512

44543a448723e1d8ad8ebe114963d89a33074de08c134b73b04b0fb6a8ed2b324c31d13b6df1750db8c61de77334d0582022f292c1bb28f8f34eca719651db6a
SSDEEP

3072:YQ9aMPTcXSi3SUzKT7H9b3K/aEd2c2s7rtke:dcdpeT7BK/Lcc9p

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\hccyasl = "{ba4840d2-32c0-8715-43d1-32c0c85a381e}"	rundll32.exe

Loads dropped DLL 2 IoCs

pid	Process
4080	rundll32.exe
4080	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\upplnfy.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\upplnfy.dll	rundll32.exe
File created	C:\Windows\SysWOW64\gbbxzrk.dll	rundll32.exe
File created	C:\Windows\SysWOW64\cxxtvng.dll	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{ba4840d2-32c0-8715-43d1-32c0c85a381e}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{ba4840d2-32c0-8715-43d1-32c0c85a381e}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{ba4840d2-32c0-8715-43d1-32c0c85a381e}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{ba4840d2-32c0-8715-43d1-32c0c85a381e}\InprocServer32\ = "C:\\Windows\\SysWow64\\cxxtvng.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{ba4840d2-32c0-8715-43d1-32c0c85a381e}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4080	rundll32.exe
4080	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4080	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4080	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1140 wrote to memory of 4080	1140	rundll32.exe	88
PID 1140 wrote to memory of 4080	1140	rundll32.exe	88
PID 1140 wrote to memory of 4080	1140	rundll32.exe	88

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\0207350b914401ce4d3f28b11014a761.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1140
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\0207350b914401ce4d3f28b11014a761.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 SetWindowsHookEx
  PID:4080

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

C:\Windows\SysWOW64\gbbxzrk.dll

Filesize
625KB

MD5
eccf28d7e5ccec24119b88edd160f8f4

SHA1
98509587a3d37a20b56b50fd57f823a1691a034c

SHA256
820c83c0533cfce2928e29edeaf6c255bc19ac9718b25a5656d99ffac30a03d6

SHA512
c1c94bbb781625b2317f0a8178d3a10d891fb71bca8f82cd831c484e8ab125301b82a14fe2ff070dc99a496cc00234300fa5536401018c40d49d44ae89409670

Download Submit
C:\Windows\SysWOW64\upplnfy.dll

Filesize
478KB

MD5
e99416267b61f52fa5ab994019efd359

SHA1
86d31eae707db7fe51d2556394fcf0e8e9f6b0fd

SHA256
768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774

SHA512
0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae

Download Submit
memory/4080-16-0x0000000075D80000-0x0000000075DFA000-memory.dmp

Filesize
488KB

Download
memory/4080-12-0x0000000075310000-0x0000000075400000-memory.dmp

Filesize
960KB

Download
memory/4080-13-0x0000000075310000-0x0000000075400000-memory.dmp

Filesize
960KB

Download
memory/4080-15-0x0000000075310000-0x0000000075400000-memory.dmp

Filesize
960KB

Download
memory/4080-6-0x0000000075D80000-0x0000000075DFA000-memory.dmp

Filesize
488KB

Download
memory/4080-17-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/4080-19-0x0000000075D80000-0x0000000075DFA000-memory.dmp

Filesize
488KB

Download
memory/4080-20-0x0000000075310000-0x0000000075400000-memory.dmp

Filesize
960KB

Download
memory/4080-21-0x0000000075310000-0x0000000075400000-memory.dmp

Filesize
960KB

Download
memory/4080-22-0x0000000075310000-0x0000000075400000-memory.dmp

Filesize
960KB

Download
memory/4080-24-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download