1ab2ff7a6ddcd4a3c8bec255b23abe1e817a12b5c716d3115848fa06e2630c21

General

Target

Cancellation_Letter_907142302-02242021.xls
Size

144KB
MD5

8aec18ebf6993b6fef422faf10b7d2a3
SHA1

170818aedbf5aa2cd7e09d3f7191ec77dd3b9532
SHA256

20ae15df23e6fbb766575da4b6dd854020725eab7ccff4194cc36dd0adb23763
SHA512

f1bf8ce8405ca7b211373768f1f4e77debdf5e3a976c95dd3378d530b428c069056d477407f466e930cd8a4e7773e10d83738b213de40125fad0953c3b615db0

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	4576	4764	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	520	4764	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	660	4764	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	824	4764	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	64	4764	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 opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
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

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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

4764 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

4764 EXCEL.EXE
4764 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE
4764	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 4764 wrote to memory of 4576	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 4576	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 520	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 520	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 660	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 660	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 824	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 824	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 64	4764	EXCEL.EXE	rundll32.exe
PID 4764 wrote to memory of 64	4764	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_907142302-02242021.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:4764

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4576

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:520

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:660

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:824

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:64

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/64-11-0x0000000000000000-mapping.dmp

Download
memory/520-8-0x0000000000000000-mapping.dmp

Download
memory/660-9-0x0000000000000000-mapping.dmp

Download
memory/824-10-0x0000000000000000-mapping.dmp

Download
memory/4576-7-0x0000000000000000-mapping.dmp

Download
memory/4764-2-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4764-3-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4764-4-0x00007FFBC05B0000-0x00007FFBC05C0000-memory.dmp

Filesize
64KB

Download
memory/4764-5-0x00007FFBE4380000-0x00007FFBE49B7000-memory.dmp

Filesize
6.2MB

Download
memory/4764-6-0x00007FFBC05B0000-0x00007FFBC05C0000-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