7da7cffd72c1d4cf8503f8c52fc80dc5695d4418980756118ddc1ade7057d010

General

Target

Complaint-Letter-179737565-03102021.xls
Size

276KB
MD5

cbc490561df4ba515e732409dda1c5e2
SHA1

99de9b0b984f203b35d005351a29a319f397ad3b
SHA256

27d7998ed5c47081aafb88662a805bf9bd79013559ab2c73a911f3cf0954c585
SHA512

2115c4ad7c3c18b38d287aba58b1e848183ffb8b1e4c05a7d2f765fb2ce73ca656c7ebdfff51a3aa420d22f0cac5736703b1a590a81eb9fc0323603c35db92d2

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://vasprogramer.com/xcuaqrfwpaf/44266.1068523148.dat

xlm40.dropper

http://mboard.baydevelopments.com/tkihlgt/44266.1068523148.dat

xlm40.dropper

http://porcarabanchel.es/kgbpstokjetx/44266.1068523148.dat

xlm40.dropper

http://klickprints.com/jcqywmbz/44266.1068523148.dat

xlm40.dropper

http://werkplaats1.okker.nl/jiejgtgde/44266.1068523148.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	1816	1832	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	336	1832	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	572	1832	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	560	1832	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1000	1832	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
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
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\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 (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1832 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1832 EXCEL.EXE
1832 EXCEL.EXE
1832 EXCEL.EXE

pid	process
1832	EXCEL.EXE

pid	process
1832	EXCEL.EXE
1832	EXCEL.EXE
1832	EXCEL.EXE

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1832 wrote to memory of 1816	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1816	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1816	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1816	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1816	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1816	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1816	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 336	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 336	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 336	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 336	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 336	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 336	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 336	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 572	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 572	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 572	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 572	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 572	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 572	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 572	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 560	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 560	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 560	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 560	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 560	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 560	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 560	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1000	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1000	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1000	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1000	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1000	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1000	1832	EXCEL.EXE	rundll32.exe
PID 1832 wrote to memory of 1000	1832	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-179737565-03102021.xls
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1832

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1816

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:336

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:572

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:560

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1000

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

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Downloads

memory/336-8-0x0000000000000000-mapping.dmp

Download
memory/560-12-0x0000000000000000-mapping.dmp

Download
memory/572-10-0x0000000000000000-mapping.dmp

Download
memory/1000-14-0x0000000000000000-mapping.dmp

Download
memory/1816-6-0x0000000000000000-mapping.dmp

Download
memory/1816-7-0x0000000075DE1000-0x0000000075DE3000-memory.dmp

Filesize
8KB

Download
memory/1832-2-0x000000002FDF1000-0x000000002FDF4000-memory.dmp

Filesize
12KB

Download
memory/1832-3-0x0000000070ED1000-0x0000000070ED3000-memory.dmp

Filesize
8KB

Download
memory/1832-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1956-5-0x000007FEF5D50000-0x000007FEF5FCA000-memory.dmp

Filesize
2.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads