0c611fc0b990b1269c7e5d98613c9e0ab4d3a1166370ed707b8d6063f05f6de0

General

Target

Cancellation_Letter_541411513-02242021.xls
Size

143KB
MD5

a7ba7bd69d41f3be1e69740c33c4fbf8
SHA1

d56bc9bf6e700c75b14322d174ff1c9fc881f3f0
SHA256

0c611fc0b990b1269c7e5d98613c9e0ab4d3a1166370ed707b8d6063f05f6de0
SHA512

ebb05d62cda68f61440a326902db33ab69d2404410de6c01c1f184115cce579cf76b5654663c3502c67770118e022b7a9175a1cc62523ca4e57c2fe755ab47c6

Score

10^/10

Malware Config

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	1708	4708	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1760	4708	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1004	4708	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	992	4708	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4344	4708	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

4708 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

4708 EXCEL.EXE
4708 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE
4708	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 4708 wrote to memory of 1708	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 1708	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 1760	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 1760	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 1004	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 1004	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 992	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 992	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 4344	4708	EXCEL.EXE	rundll32.exe
PID 4708 wrote to memory of 4344	4708	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_541411513-02242021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4708

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1708

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1760

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1004

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:992

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4344

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

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Downloads

memory/992-10-0x0000000000000000-mapping.dmp

Download
memory/1004-9-0x0000000000000000-mapping.dmp

Download
memory/1708-7-0x0000000000000000-mapping.dmp

Download
memory/1760-8-0x0000000000000000-mapping.dmp

Download
memory/4344-11-0x0000000000000000-mapping.dmp

Download
memory/4708-2-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download
memory/4708-3-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download
memory/4708-4-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download
memory/4708-5-0x00007FF988DA0000-0x00007FF9893D7000-memory.dmp

Filesize
6.2MB

Download
memory/4708-6-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads