4c6dcbefc272d8ff6cd6276398c960c1f765219b62bfc299289e90f38e8f34cc

General

Target

Cancellation_Letter_217264958-02242021.xls
Size

144KB
MD5

389468f5a4fe1158686489601158c933
SHA1

0bc2d33169724e8783b16b7ac4cf3664b8110ee0
SHA256

4c6dcbefc272d8ff6cd6276398c960c1f765219b62bfc299289e90f38e8f34cc
SHA512

fcebe3686bd601bfa5dec9e8a5c766ad8ebc5ca5568c429ed436505a0af08a1dffca30e3aa6d5ff7d8ee3558ba0f86584ab2c7e76005d5ac9a2c66efc384df50

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	3848	4704	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4340	4704	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3256	4704	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	564	4704	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	656	4704	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\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	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

4704 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

4704 EXCEL.EXE
4704 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE
4704	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 4704 wrote to memory of 3848	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 3848	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 4340	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 4340	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 3256	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 3256	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 564	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 564	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 656	4704	EXCEL.EXE	rundll32.exe
PID 4704 wrote to memory of 656	4704	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_217264958-02242021.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:4704

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3848

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4340

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3256

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:564

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:656

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/564-10-0x0000000000000000-mapping.dmp

Download
memory/656-11-0x0000000000000000-mapping.dmp

Download
memory/3256-9-0x0000000000000000-mapping.dmp

Download
memory/3848-7-0x0000000000000000-mapping.dmp

Download
memory/4340-8-0x0000000000000000-mapping.dmp

Download
memory/4704-2-0x00007FF82F820000-0x00007FF82F830000-memory.dmp

Filesize
64KB

Download
memory/4704-3-0x00007FF82F820000-0x00007FF82F830000-memory.dmp

Filesize
64KB

Download
memory/4704-4-0x00007FF82F820000-0x00007FF82F830000-memory.dmp

Filesize
64KB

Download
memory/4704-5-0x00007FF853020000-0x00007FF853657000-memory.dmp

Filesize
6.2MB

Download
memory/4704-6-0x00007FF82F820000-0x00007FF82F830000-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