8cc2010fc8b821fc0a63dc91a58d3ccc2c513844659b837221d8e3877b6eb996

General

Target

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

276KB
MD5

abc17c7ad001bb1d738fe6c574538b84
SHA1

676f164fdce391f39f77d8f570441f1917843bfc
SHA256

8cc2010fc8b821fc0a63dc91a58d3ccc2c513844659b837221d8e3877b6eb996
SHA512

90821948f2bdaeb292fe74df97a8d526943c4ead49d31e864bf75e620a62107b827f7f7942b8cce2e144bb2f8874cbe5bf315a246a685d0f2a767bfa302e68f5

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://vasprogramer.com/xcuaqrfwpaf/44266.6085646991.dat

xlm40.dropper

http://mboard.baydevelopments.com/tkihlgt/44266.6085646991.dat

xlm40.dropper

http://porcarabanchel.es/kgbpstokjetx/44266.6085646991.dat

xlm40.dropper

http://klickprints.com/jcqywmbz/44266.6085646991.dat

xlm40.dropper

http://werkplaats1.okker.nl/jiejgtgde/44266.6085646991.dat

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 (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1268	844	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	440	844	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	436	844	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1740	844	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1836	844	rundll32.exe	EXCEL.EXE

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

EXCEL.EXE

description ioc process

Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

844 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

844 EXCEL.EXE
844 EXCEL.EXE
844 EXCEL.EXE

pid	process
844	EXCEL.EXE

pid	process
844	EXCEL.EXE
844	EXCEL.EXE
844	EXCEL.EXE

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 844 wrote to memory of 1268	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1268	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1268	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1268	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1268	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1268	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1268	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 440	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 440	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 440	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 440	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 440	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 440	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 440	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 436	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 436	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 436	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 436	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 436	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 436	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 436	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1740	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1740	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1740	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1740	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1740	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1740	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1740	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1836	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1836	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1836	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1836	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1836	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1836	844	EXCEL.EXE	rundll32.exe
PID 844 wrote to memory of 1836	844	EXCEL.EXE	rundll32.exe

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\Complaint-Letter-1121854452-03102021.lls.xls
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:844

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1268

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:440

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:436

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1740

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1836

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/436-10-0x0000000000000000-mapping.dmp

Download
memory/440-8-0x0000000000000000-mapping.dmp

Download
memory/844-2-0x000000002FBF1000-0x000000002FBF4000-memory.dmp

Filesize
12KB

Download
memory/844-3-0x0000000071911000-0x0000000071913000-memory.dmp

Filesize
8KB

Download
memory/844-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1268-6-0x0000000000000000-mapping.dmp

Download
memory/1268-7-0x0000000076881000-0x0000000076883000-memory.dmp

Filesize
8KB

Download
memory/1484-5-0x000007FEF6790000-0x000007FEF6A0A000-memory.dmp

Filesize
2.5MB

Download
memory/1740-12-0x0000000000000000-mapping.dmp

Download
memory/1836-14-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads