528843c02e759ea8beec1cfb2046c9ebde01670970db90ef90048237a387e61a

General

Target

Complaint-Letter-1770545757-03102021.xls
Size

276KB
MD5

1b09e1cc905855e5e03f5bfdf28874d2
SHA1

3b5ee62ed39e5d50ff4c41a269b0759d8d7f2088
SHA256

75576374f31710e474434faa2c28d5764f021962106815f06a3e819df48188f6
SHA512

b2d1919de1fa234303f93dcf831d04de995b294e190df64d52e8fa2967ae011eea89d3b32ae20332bfd8dcda0a10db250e357c9fa651eaf66edeffea2d99306f

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://vasprogramer.com/xcuaqrfwpaf/44266.1465023148.dat

xlm40.dropper

http://mboard.baydevelopments.com/tkihlgt/44266.1465023148.dat

xlm40.dropper

http://porcarabanchel.es/kgbpstokjetx/44266.1465023148.dat

xlm40.dropper

http://klickprints.com/jcqywmbz/44266.1465023148.dat

xlm40.dropper

http://werkplaats1.okker.nl/jiejgtgde/44266.1465023148.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	736	1096	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1764	1096	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1368	1096	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1240	1096	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	544	1096	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-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1096 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1096 EXCEL.EXE
1096 EXCEL.EXE
1096 EXCEL.EXE

pid	process
1096	EXCEL.EXE

pid	process
1096	EXCEL.EXE
1096	EXCEL.EXE
1096	EXCEL.EXE

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1096 wrote to memory of 736	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 736	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 736	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 736	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 736	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 736	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 736	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1764	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1764	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1764	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1764	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1764	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1764	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1764	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1368	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1368	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1368	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1368	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1368	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1368	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1368	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1240	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1240	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1240	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1240	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1240	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1240	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 1240	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 544	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 544	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 544	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 544	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 544	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 544	1096	EXCEL.EXE	rundll32.exe
PID 1096 wrote to memory of 544	1096	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-1770545757-03102021.xls
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1096

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:736

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1764

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1368

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1240

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:544

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/544-14-0x0000000000000000-mapping.dmp

Download
memory/736-6-0x0000000000000000-mapping.dmp

Download
memory/736-7-0x00000000761F1000-0x00000000761F3000-memory.dmp

Filesize
8KB

Download
memory/1096-2-0x000000002F1B1000-0x000000002F1B4000-memory.dmp

Filesize
12KB

Download
memory/1096-3-0x0000000071951000-0x0000000071953000-memory.dmp

Filesize
8KB

Download
memory/1096-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1144-5-0x000007FEF7AA0000-0x000007FEF7D1A000-memory.dmp

Filesize
2.5MB

Download
memory/1240-12-0x0000000000000000-mapping.dmp

Download
memory/1368-10-0x0000000000000000-mapping.dmp

Download
memory/1764-8-0x0000000000000000-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