640a91f196f3e0e14674fc22ecce5aa7958d392450c6ea5889db1067896d922d

General

Target

Cancellation_Letter_1890704928-02242021.xls
Size

143KB
MD5

0d77e619d3652249d3424f46650d85b5
SHA1

62983f38e8a5275e3ac30f8a76e8886291c6fd7a
SHA256

e6ea08afb1528f524fd091fae173be6aec7d4a02ea13725c547314df7dceff4d
SHA512

9fd82d78380816b481b3eb1f1108832e098ce9286e3cc62a7a11931fbdf4047e5ca13023bf4618b5a4f7674b88197eadc1100e81a9965a18c1bda356767182a8
SSDEEP

3072:6cPiTQAVW/89BQnmlcGvgZ6Gr3J8YUOMFt/BI/s/C/i/R/7/3/UQ/OhP/2/a/1/v:6cPiTQAVW/89BQnmlcGvgZ7r3J8YUOMK

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper

http://sumonpro.xyz/nseoqnwbbvmc/44955848520486100000.dat

xlm40.dropper

http://vngkinderopvang.nl/rmyjq/44955848520486100000.dat

xlm40.dropper

http://stadt-fuchs.net/gwixglx/44955848520486100000.dat

xlm40.dropper

http://hdmedia.pro/noexyryqori/44955848520486100000.dat

xlm40.dropper

http://www.fernway.com/xjhuljbqv/44955848520486100000.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\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4044	4208	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4256	4208	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3516	4208	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3772	4208	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4816	4208	rundll32.exe	EXCEL.EXE

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

4208 EXCEL.EXE

Suspicious use of SetWindowsHookEx 15 IoCs

Processes:

EXCEL.EXE

pid	process
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE
4208	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 4208 wrote to memory of 4044	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 4044	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 4256	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 4256	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 3516	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 3516	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 3772	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 3772	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 4816	4208	EXCEL.EXE	rundll32.exe
PID 4208 wrote to memory of 4816	4208	EXCEL.EXE	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Cancellation_Letter_1890704928-02242021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4208

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4044

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4256

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3516

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3772

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4816

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\GDAS.UKDSR3
Filesize
24KB

MD5
2f977d5872cb7eb7a560eb0b0a540baf

SHA1
c8e2d0134632884763d3922bdae5d1245207259c

SHA256
3b8a21beff2c38dad1d682f7876cf1233fd7a8325b99292400828b6d9c4b3c38

SHA512
15f89220c95de08df80eeabf3acbfed6490e43df568d3869bf39677819ff017f68a64c986c2bd86aa39b13ad96317f84fcdb6a51e2f1bdb54c3992862b309b69

Download Submit
memory/3516-141-0x0000000000000000-mapping.dmp

Download
memory/3772-142-0x0000000000000000-mapping.dmp

Download
memory/4044-139-0x0000000000000000-mapping.dmp

Download
memory/4208-135-0x00007FFA45370000-0x00007FFA45380000-memory.dmp

Filesize
64KB

Download
memory/4208-137-0x00007FFA42FA0000-0x00007FFA42FB0000-memory.dmp

Filesize
64KB

Download
memory/4208-138-0x00007FFA42FA0000-0x00007FFA42FB0000-memory.dmp

Filesize
64KB

Download
memory/4208-136-0x00007FFA45370000-0x00007FFA45380000-memory.dmp

Filesize
64KB

Download
memory/4208-132-0x00007FFA45370000-0x00007FFA45380000-memory.dmp

Filesize
64KB

Download
memory/4208-134-0x00007FFA45370000-0x00007FFA45380000-memory.dmp

Filesize
64KB

Download
memory/4208-133-0x00007FFA45370000-0x00007FFA45380000-memory.dmp

Filesize
64KB

Download
memory/4256-140-0x0000000000000000-mapping.dmp

Download
memory/4816-144-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads