e3419e17335cdbcd018cb67aeb3475c7513496d2ddd12b5e5dbc50ad464e87ef

General

Target

Complaint-Letter-1768077996-03102021.xls
Size

276KB
MD5

122e75358ae9db054aa4843ee1543db9
SHA1

d459af154bdd0f606a378a40cbca16c0b8246a00
SHA256

fd3ceedd03ccec43d6569d2b8a9e961d8ef63ea331143a4ca9da1b780807053e
SHA512

529d0ba46ac7ca77a02b4a2a26bda4e113fddf42fe0f9bbc56dd7e59cea69d5b158ece8ef35e26d11b1a5ca88a99e1b6179763da2bb22e7539a01622be5a98a8

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://vasprogramer.com/xcuaqrfwpaf/44266.142337037.dat

xlm40.dropper

http://mboard.baydevelopments.com/tkihlgt/44266.142337037.dat

xlm40.dropper

http://porcarabanchel.es/kgbpstokjetx/44266.142337037.dat

xlm40.dropper

http://klickprints.com/jcqywmbz/44266.142337037.dat

xlm40.dropper

http://werkplaats1.okker.nl/jiejgtgde/44266.142337037.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	1628	308	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1744	308	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1724	308	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	964	308	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	332	308	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
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
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
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
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
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

308 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

308 EXCEL.EXE
308 EXCEL.EXE
308 EXCEL.EXE

pid	process
308	EXCEL.EXE

pid	process
308	EXCEL.EXE
308	EXCEL.EXE
308	EXCEL.EXE

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 308 wrote to memory of 1628	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1628	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1628	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1628	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1628	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1628	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1628	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1744	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1744	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1744	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1744	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1744	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1744	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1744	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1724	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1724	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1724	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1724	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1724	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1724	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 1724	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 964	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 964	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 964	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 964	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 964	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 964	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 964	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 332	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 332	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 332	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 332	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 332	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 332	308	EXCEL.EXE	rundll32.exe
PID 308 wrote to memory of 332	308	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-1768077996-03102021.xls
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:308
- C:\Windows\SysWOW64\rundll32.exe
  rundll32 ..\Runtime.brok,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1628
- C:\Windows\SysWOW64\rundll32.exe
  rundll32 ..\Runtime.brok1,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1744
- C:\Windows\SysWOW64\rundll32.exe
  rundll32 ..\Runtime.brok2,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1724
- C:\Windows\SysWOW64\rundll32.exe
  rundll32 ..\Runtime.brok3,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:964
- C:\Windows\SysWOW64\rundll32.exe
  rundll32 ..\Runtime.brok4,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:332

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

Replay Monitor

Loading Replay Monitor...

Downloads

memory/308-2-0x000000002F971000-0x000000002F974000-memory.dmp

Filesize
12KB

Download
memory/308-3-0x0000000070FA1000-0x0000000070FA3000-memory.dmp

Filesize
8KB

Download
memory/308-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/332-14-0x0000000000000000-mapping.dmp

Download
memory/964-12-0x0000000000000000-mapping.dmp

Download
memory/1416-5-0x000007FEF7040000-0x000007FEF72BA000-memory.dmp

Filesize
2.5MB

Download
memory/1628-6-0x0000000000000000-mapping.dmp

Download
memory/1628-7-0x0000000075C61000-0x0000000075C63000-memory.dmp

Filesize
8KB

Download
memory/1724-10-0x0000000000000000-mapping.dmp

Download
memory/1744-8-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads