6085c924953fc6df458ae7475746d83ad094adc24ee3198692dcfdbfe9d6a656

General

Target

19072021-Lect-348.xlsm
Size

184KB
MD5

d1175555f18d52d6a564e55724322215
SHA1

b4577aac9e4955b08d287eda7318bd31ae914912
SHA256

6085c924953fc6df458ae7475746d83ad094adc24ee3198692dcfdbfe9d6a656
SHA512

f89ad0055fe4959ece0dfbcba354dbc3a8944df9e40df069f22164455fb5d9176d653f8530e13c45cf4d6e310c330d9b37ce3a442b39ed0300fd57aa224f38bb

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://fourstars.cyou/1.php

Signatures

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

regsvr32.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	836	1052	regsvr32.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-1-5-21-2513283230-931923277-594887482-1000\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-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\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-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1052 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1052 EXCEL.EXE
1052 EXCEL.EXE
1052 EXCEL.EXE

pid	process
1052	EXCEL.EXE

pid	process
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1052 wrote to memory of 836	1052	EXCEL.EXE	regsvr32.exe
PID 1052 wrote to memory of 836	1052	EXCEL.EXE	regsvr32.exe
PID 1052 wrote to memory of 836	1052	EXCEL.EXE	regsvr32.exe
PID 1052 wrote to memory of 836	1052	EXCEL.EXE	regsvr32.exe
PID 1052 wrote to memory of 836	1052	EXCEL.EXE	regsvr32.exe
PID 1052 wrote to memory of 836	1052	EXCEL.EXE	regsvr32.exe
PID 1052 wrote to memory of 836	1052	EXCEL.EXE	regsvr32.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\19072021-Lect-348.xlsm
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1052

C:\Windows\SysWOW64\regsvr32.exe
regsvr32 -silent ..\91919.dll
2⤵
- Process spawned unexpected child process
PID:836

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/836-63-0x0000000000000000-mapping.dmp

Download
memory/836-64-0x0000000075721000-0x0000000075723000-memory.dmp

Filesize
8KB

Download
memory/1052-60-0x000000002FD01000-0x000000002FD04000-memory.dmp

Filesize
12KB

Download
memory/1052-61-0x00000000711A1000-0x00000000711A3000-memory.dmp

Filesize
8KB

Download
memory/1052-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads