fc8bbe7b84a60771d654fb9efd2cc848e3f3ffe72ce3bb395326d9a15fbd1f59

General

Target

Complaint-Letter-1973823858-03102021.xls
Size

276KB
MD5

8432ec3b0604d96a7ec137b80ac050a2
SHA1

63dfe8269e0451a0a54d91706d85132f50188ea0
SHA256

fc8bbe7b84a60771d654fb9efd2cc848e3f3ffe72ce3bb395326d9a15fbd1f59
SHA512

91f744e0d9e34c0f5adfd88e405f18e180f469e6da457efaea80c841dfaf7f231886c785aa12033c014aba0b418c5fbf74929de1efed73df3a5a72ccedf640b3

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://vasprogramer.com/xcuaqrfwpaf/44267.6477175926.dat

xlm40.dropper

http://mboard.baydevelopments.com/tkihlgt/44267.6477175926.dat

xlm40.dropper

http://porcarabanchel.es/kgbpstokjetx/44267.6477175926.dat

xlm40.dropper

http://klickprints.com/jcqywmbz/44267.6477175926.dat

xlm40.dropper

http://werkplaats1.okker.nl/jiejgtgde/44267.6477175926.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	1148	644	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	516	644	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1472	644	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1120	644	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	996	644	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\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\Toolbar	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
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
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

644 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

644 EXCEL.EXE
644 EXCEL.EXE
644 EXCEL.EXE

pid	process
644	EXCEL.EXE

pid	process
644	EXCEL.EXE
644	EXCEL.EXE
644	EXCEL.EXE

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 644 wrote to memory of 1148	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1148	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1148	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1148	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1148	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1148	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1148	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 516	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 516	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 516	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 516	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 516	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 516	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 516	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1472	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1472	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1472	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1472	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1472	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1472	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1472	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1120	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1120	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1120	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1120	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1120	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1120	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 1120	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 996	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 996	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 996	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 996	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 996	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 996	644	EXCEL.EXE	rundll32.exe
PID 644 wrote to memory of 996	644	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-1973823858-03102021.xls
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:644

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1148

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:516

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1472

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1120

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:996

Network

MITRE ATT&CK Enterprise 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

Command and Control

Exfiltration

Impact

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Downloads

memory/516-8-0x0000000000000000-mapping.dmp

Download
memory/644-2-0x000000002FAE1000-0x000000002FAE4000-memory.dmp

Filesize
12KB

Download
memory/644-3-0x0000000071581000-0x0000000071583000-memory.dmp

Filesize
8KB

Download
memory/644-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/996-14-0x0000000000000000-mapping.dmp

Download
memory/1120-12-0x0000000000000000-mapping.dmp

Download
memory/1148-6-0x0000000000000000-mapping.dmp

Download
memory/1148-7-0x00000000765E1000-0x00000000765E3000-memory.dmp

Filesize
8KB

Download
memory/1320-5-0x000007FEF6230000-0x000007FEF64AA000-memory.dmp

Filesize
2.5MB

Download
memory/1472-10-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads