0c611fc0b990b1269c7e5d98613c9e0ab4d3a1166370ed707b8d6063f05f6de0

General

Target

Cancellation_Letter_541411513-02242021.xls
Size

143KB
MD5

a7ba7bd69d41f3be1e69740c33c4fbf8
SHA1

d56bc9bf6e700c75b14322d174ff1c9fc881f3f0
SHA256

0c611fc0b990b1269c7e5d98613c9e0ab4d3a1166370ed707b8d6063f05f6de0
SHA512

ebb05d62cda68f61440a326902db33ab69d2404410de6c01c1f184115cce579cf76b5654663c3502c67770118e022b7a9175a1cc62523ca4e57c2fe755ab47c6

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://sumonpro.xyz/nseoqnwbbvmc/44252290155555600000.dat

xlm40.dropper

http://vngkinderopvang.nl/rmyjq/44252290155555600000.dat

xlm40.dropper

http://stadt-fuchs.net/gwixglx/44252290155555600000.dat

xlm40.dropper

http://hdmedia.pro/noexyryqori/44252290155555600000.dat

xlm40.dropper

http://www.fernway.com/xjhuljbqv/44252290155555600000.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	868	548	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1168	548	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	688	548	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	900	548	rundll32.exe	EXCEL.EXE
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1064	548	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\MenuExt\Se&nd to OneNote	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 (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
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	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 (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\Toolbar	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

548 EXCEL.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

548 EXCEL.EXE
548 EXCEL.EXE
548 EXCEL.EXE

pid	process
548	EXCEL.EXE

pid	process
548	EXCEL.EXE
548	EXCEL.EXE
548	EXCEL.EXE

Suspicious use of WriteProcessMemory 35 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 548 wrote to memory of 868	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 868	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 868	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 868	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 868	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 868	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 868	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1168	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1168	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1168	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1168	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1168	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1168	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1168	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 688	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 688	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 688	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 688	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 688	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 688	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 688	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 900	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 900	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 900	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 900	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 900	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 900	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 900	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1064	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1064	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1064	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1064	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1064	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1064	548	EXCEL.EXE	rundll32.exe
PID 548 wrote to memory of 1064	548	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\Cancellation_Letter_541411513-02242021.xls
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:548

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\GDAS.UKDSR,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:868

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\GDAS.UKDSR1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1168

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\GDAS.UKDSR2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:688

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\GDAS.UKDSR3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:900

C:\Windows\SysWOW64\rundll32.exe
rundll32 ..\GDAS.UKDSR4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1064

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/548-2-0x000000002FB61000-0x000000002FB64000-memory.dmp

Filesize
12KB

Download
memory/548-3-0x0000000071AA1000-0x0000000071AA3000-memory.dmp

Filesize
8KB

Download
memory/548-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/688-10-0x0000000000000000-mapping.dmp

Download
memory/868-6-0x0000000000000000-mapping.dmp

Download
memory/868-7-0x0000000076451000-0x0000000076453000-memory.dmp

Filesize
8KB

Download
memory/900-12-0x0000000000000000-mapping.dmp

Download
memory/1064-14-0x0000000000000000-mapping.dmp

Download
memory/1168-8-0x0000000000000000-mapping.dmp

Download
memory/1704-5-0x000007FEF8800000-0x000007FEF8A7A000-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