f04afa122d919fe049eb055ab6d29f8a414b4041440af660895916b7e32f20a0

Analysis

max time kernel
149s
max time network
135s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
31/01/2025, 18:47

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General

Target

virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Size

694KB
MD5

e9db7f543abe55498e2fe9e81adbd150
SHA1

733744d9a70cd274c03136ff77fdf4e2e92ef3b8
SHA256

eaf8a5f8274a994a5102074b58d341d6d5f8bead8ef8ff1eef1c1a233d621ac9
SHA512

a4cc8e5b0c15c0a6e1c6a665dbbf0b05ccefd89d5f78f31eba08bdc9e409248cc169a6a10adfe1bc3c282854ad37247a9d27f714db1dc953b6e63f7f2b8292ab
SSDEEP

768:5BBdFYDgao5/AUrLEEzayTpBJfxBDlxcFNXK8D1Foj/:5pcC/eAayJ3Rx0g

Score

7^/10

discovery persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4800	rundll32.exe

Modifies system executable filetype association 2 TTPs 5 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\¢«.exe	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
File created	C:\Windows\SysWOW64\notepad¢¬.exe	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\system\rundll32.exe	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Modifies registry class 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainSetup = "1738349319"	rundll32.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainUp = "1738349319"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Key created	\REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Key created	\REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1"	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad.exe %1"	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
Key created	\REGISTRY\MACHINE\Software\Classes\MSipv	rundll32.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainVer = "505"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\MSipv	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4800	rundll32.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
4800	rundll32.exe
4800	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3592 wrote to memory of 4800	3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe	84
PID 3592 wrote to memory of 4800	3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe	84
PID 3592 wrote to memory of 4800	3592	virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe	84

C:\Users\Admin\AppData\Local\Temp\virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe
"C:\Users\Admin\AppData\Local\Temp\virussign.com_e9db7f543abe55498e2fe9e81adbd150.exe"
1⤵
- Modifies system executable filetype association
- Drops file in System32 directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3592
- C:\Windows\system\rundll32.exe
  C:\Windows\system\rundll32.exe
  2⤵
  - Executes dropped EXE
  - Modifies system executable filetype association
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  PID:4800

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System\rundll32.exe

Filesize
697KB

MD5
c73c542bde1ef468ace9a43c78b68f4c

SHA1
0db89f4946f720324c1f245d7a132d71e91391b8

SHA256
4007c85f981ab0912706087ea448ce47e5c9485bdff6594d57d63a4e8f8ba6af

SHA512
fa65ce421ec883e0c34bd335fc0a4f5d40fabd1a6ee59b33c9dbaea24b1d357ae241cba8a365ce80239b46ff64292352aded1e43aa393327717f6a07dcfd37b9

Download Submit
memory/3592-0-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/3592-7-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4800-8-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download