8cc2010fc8b821fc0a63dc91a58d3ccc2c513844659b837221d8e3877b6eb996

General

Target

Complaint-Letter-1121854452-03102021.lls.xls
Size

276KB
MD5

abc17c7ad001bb1d738fe6c574538b84
SHA1

676f164fdce391f39f77d8f570441f1917843bfc
SHA256

8cc2010fc8b821fc0a63dc91a58d3ccc2c513844659b837221d8e3877b6eb996
SHA512

90821948f2bdaeb292fe74df97a8d526943c4ead49d31e864bf75e620a62107b827f7f7942b8cce2e144bb2f8874cbe5bf315a246a685d0f2a767bfa302e68f5

Score

10^/10

Malware Config

Signatures

Process spawned unexpected child process 5 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

rundll32.exerundll32.exerundll32.exerundll32.exerundll32.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1912	1048	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1232	1048	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3944	1048	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4064	1048	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3588	1048	rundll32.exe	EXCEL.EXE

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1048 EXCEL.EXE

Suspicious use of SetWindowsHookEx 13 IoCs

Processes:

EXCEL.EXE

pid	process
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE
1048	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1048 wrote to memory of 1912	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 1912	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 1232	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 1232	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 3944	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 3944	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 4064	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 4064	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 3588	1048	EXCEL.EXE	rundll32.exe
PID 1048 wrote to memory of 3588	1048	EXCEL.EXE	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Complaint-Letter-1121854452-03102021.lls.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1048

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1912

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1232

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3944

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4064

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3588

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/1048-2-0x00007FF920240000-0x00007FF920250000-memory.dmp

Filesize
64KB

Download
memory/1048-3-0x00007FF920240000-0x00007FF920250000-memory.dmp

Filesize
64KB

Download
memory/1048-4-0x00007FF920240000-0x00007FF920250000-memory.dmp

Filesize
64KB

Download
memory/1048-5-0x00007FF920240000-0x00007FF920250000-memory.dmp

Filesize
64KB

Download
memory/1048-6-0x00007FF943A40000-0x00007FF944077000-memory.dmp

Filesize
6.2MB

Download
memory/1232-8-0x0000000000000000-mapping.dmp

Download
memory/1912-7-0x0000000000000000-mapping.dmp

Download
memory/3588-11-0x0000000000000000-mapping.dmp

Download
memory/3944-9-0x0000000000000000-mapping.dmp

Download
memory/4064-10-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads