84d10b6f0f9746db37315a9df09016ab1da5e7c2918c2d0e6ddb90b23cbd6df3

General

Target

Complaint-Letter-1562041087-03102021.xls
Size

276KB
MD5

97f27473726b5df577af145b2c6446c9
SHA1

9c670a3fbad0d5f32913a1d823aeed4210cdb8cd
SHA256

6324f93b071899aefccb5d511efa75ced57554a51ef6c6281cafde5a78febcfc
SHA512

dce62d4d96aaab916b502d0873a70320c71af072b489954555ca3969cb575ca7dcfa29020153f8350b3fad40291861546e0bb0f0f8bf3e8b2abd682e287b47c5

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://vasprogramer.com/xcuaqrfwpaf/44266.6276302083.dat

xlm40.dropper

http://mboard.baydevelopments.com/tkihlgt/44266.6276302083.dat

xlm40.dropper

http://porcarabanchel.es/kgbpstokjetx/44266.6276302083.dat

xlm40.dropper

http://klickprints.com/jcqywmbz/44266.6276302083.dat

xlm40.dropper

http://werkplaats1.okker.nl/jiejgtgde/44266.6276302083.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	1672	792	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1752	792	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1748	792	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	928	792	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1152	792	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 (int)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	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 (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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

792 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

792 EXCEL.EXE
792 EXCEL.EXE
792 EXCEL.EXE

pid	process
792	EXCEL.EXE

pid	process
792	EXCEL.EXE
792	EXCEL.EXE
792	EXCEL.EXE

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 792 wrote to memory of 1672	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1672	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1672	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1672	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1672	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1672	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1672	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1752	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1752	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1752	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1752	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1752	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1752	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1752	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1748	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1748	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1748	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1748	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1748	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1748	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1748	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 928	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 928	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 928	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 928	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 928	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 928	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 928	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1152	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1152	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1152	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1152	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1152	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1152	792	EXCEL.EXE	rundll32.exe
PID 792 wrote to memory of 1152	792	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-1562041087-03102021.xls
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:792

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1672

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1752

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1748

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:928

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1152

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/792-2-0x000000002F321000-0x000000002F324000-memory.dmp

Filesize
12KB

Download
memory/792-3-0x0000000071CB1000-0x0000000071CB3000-memory.dmp

Filesize
8KB

Download
memory/792-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/928-12-0x0000000000000000-mapping.dmp

Download
memory/1152-14-0x0000000000000000-mapping.dmp

Download
memory/1672-6-0x0000000000000000-mapping.dmp

Download
memory/1672-7-0x00000000757E1000-0x00000000757E3000-memory.dmp

Filesize
8KB

Download
memory/1748-10-0x0000000000000000-mapping.dmp

Download
memory/1752-8-0x0000000000000000-mapping.dmp

Download
memory/2004-5-0x000007FEF7F80000-0x000007FEF81FA000-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