d30dca05a381ea0ca9740238fc7b50e5174785a17dd0efe1418d0038a99bc486

General

Target

Cancellation_Letter_284726374-02242021.xls
Size

144KB
MD5

421de792f2c24cb994f9e9d17729a51a
SHA1

92001d386aefaecda416eebb1396867a5a86a425
SHA256

d30dca05a381ea0ca9740238fc7b50e5174785a17dd0efe1418d0038a99bc486
SHA512

4c7e02649888a8c92668098cfbe0dfbe322d5da23bd943f9dc0a4df9ba092cb73b5c81487b4ed17da8401fd96bace0fb26875932e0951f156721ca9e8194bc4b

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	2896	828	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3776	828	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	768	828	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4048	828	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2068	828	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 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

828 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE
828	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 828 wrote to memory of 2896	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 2896	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 3776	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 3776	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 768	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 768	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 4048	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 4048	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 2068	828	EXCEL.EXE	rundll32.exe
PID 828 wrote to memory of 2068	828	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_284726374-02242021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:828

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2896

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3776

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:768

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4048

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\GDAS.UKDSR4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2068

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/768-9-0x0000000000000000-mapping.dmp

Download
memory/828-2-0x00007FFACA7F0000-0x00007FFACA800000-memory.dmp

Filesize
64KB

Download
memory/828-3-0x00007FFACA7F0000-0x00007FFACA800000-memory.dmp

Filesize
64KB

Download
memory/828-4-0x00007FFACA7F0000-0x00007FFACA800000-memory.dmp

Filesize
64KB

Download
memory/828-6-0x00007FFACA7F0000-0x00007FFACA800000-memory.dmp

Filesize
64KB

Download
memory/828-5-0x00007FFAEE490000-0x00007FFAEEAC7000-memory.dmp

Filesize
6.2MB

Download
memory/2068-11-0x0000000000000000-mapping.dmp

Download
memory/2896-7-0x0000000000000000-mapping.dmp

Download
memory/3776-8-0x0000000000000000-mapping.dmp

Download
memory/4048-10-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads