09e6b46502c94b3cb5d7b8dd9c9dcda29f2d140488d8c09415ea9b0c6b484019

General

Target

Complaint-Letter-569691619-03102021.xls
Size

276KB
MD5

f05457b10a928c0a84211af6dd3a535e
SHA1

6cf3b1e91afeb5bf54f466a38bc3a8fc24b66b19
SHA256

dd357107e0c6c37da4aa8a5db0a555f904ad2d02851e31c60dea5fc1e7194981
SHA512

6684de7baa4419f5c848921d36340a753e6a1e3ed7235fadf3b2c0bb5164396f6315b6524e7095be431fa2927b0f7f53c5d99557e973415ffbc4bce30a70aa5e

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	3796	1176	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4020	1176	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3968	1176	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3720	1176	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3508	1176	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 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
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1176 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

1176 EXCEL.EXE
1176 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE
1176	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1176 wrote to memory of 3796	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 3796	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 4020	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 4020	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 3968	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 3968	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 3720	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 3720	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 3508	1176	EXCEL.EXE	rundll32.exe
PID 1176 wrote to memory of 3508	1176	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-569691619-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1176

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3796

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4020

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3968

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3720

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3508

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\Runtime.brok1
MD5
153665460fe2578e8dc4e36ef7077d80

SHA1
40a90b6f98c358bdbdd6e5842c186d919cdde7e3

SHA256
3ad4b3ff863a1ff41ea1e6ebb34f374a8d54804ec27b5531d05e579374bd602b

SHA512
31abced5777e4c5dd3f155fbda068ab786a57e0d24cb535d41379c471011a6ac757f2ad4802c52249b3280065c4ce31e3a7f932637d8ee37adbccdab3a2bf2f8

Download Submit
memory/1176-2-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/1176-3-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/1176-4-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/1176-5-0x00007FFE20860000-0x00007FFE20E97000-memory.dmp

Filesize
6.2MB

Download
memory/1176-6-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/3508-12-0x0000000000000000-mapping.dmp

Download
memory/3720-11-0x0000000000000000-mapping.dmp

Download
memory/3796-7-0x0000000000000000-mapping.dmp

Download
memory/3968-10-0x0000000000000000-mapping.dmp

Download
memory/4020-8-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads