bc64eb93cd133670e5e997bdee03928d2408281ed8f07142ee13371da5352f88

General

Target
subscription_1617898525.xlsb
Size 250KB
Sample210408-4c7659pj6e
SHA256 bc64eb93cd133670e5e997bdee03928d2408281ed8f07142ee13371da5352f88
MD5 9d39f307b0d6276450038cca7568b2cc
SHA1 72d0c43d84791c50e600d85e6deb2b9021cf7056
SHA512 17e98e6da13405142295953f6deb0cd7d44751bf83a22833a7b9747e21ae46630c1edb7d176edcd21f14428182135db181153a06ddd9e3fc70246514f6f1f127
MD5 SHA1 SHA512

Score

10^/10

Malware Config

Signatures

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4024	4812	cmd.exe	67

Blocklisted process makes network request 1 IoCs

flow	pid	Process
29	4540	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
4540	rundll32.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

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

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

pid	Process
4812	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE
4812	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4812 wrote to memory of 4024	4812	EXCEL.EXE	81
PID 4812 wrote to memory of 4024	4812	EXCEL.EXE	81
PID 4024 wrote to memory of 2224	4024	cmd.exe	83
PID 4024 wrote to memory of 2224	4024	cmd.exe	83
PID 4024 wrote to memory of 4576	4024	cmd.exe	84
PID 4024 wrote to memory of 4576	4024	cmd.exe	84
PID 4576 wrote to memory of 4540	4576	rundll32.exe	85
PID 4576 wrote to memory of 4540	4576	rundll32.exe	85
PID 4576 wrote to memory of 4540	4576	rundll32.exe	85

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\subscription_1617898525.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4812
- C:\Windows\SYSTEM32\cmd.exe
  cmd.exe /c certutil -decode %PUBLIC%\14118.doy %PUBLIC%\14118.biy && rundll32 %PUBLIC%\14118.biy,DF1
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:4024
- - C:\Windows\system32\certutil.exe
    certutil -decode C:\Users\Public\14118.doy C:\Users\Public\14118.biy
    3⤵
    PID:2224
- - C:\Windows\system32\rundll32.exe
    rundll32 C:\Users\Public\14118.biy,DF1
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4576
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32 C:\Users\Public\14118.biy,DF1
      4⤵
      Blocklisted process makes network request
      Loads dropped DLL
      PID:4540

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/4812-115-0x00007FFA3D590000-0x00007FFA3D5A0000-memory.dmp

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memory/4812-123-0x000001C641760000-0x000001C643655000-memory.dmp

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memory/4812-122-0x00007FFA5DB60000-0x00007FFA5EC4E000-memory.dmp

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memory/4812-119-0x00007FFA3D590000-0x00007FFA3D5A0000-memory.dmp

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memory/4812-118-0x00007FFA3D590000-0x00007FFA3D5A0000-memory.dmp

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memory/4812-114-0x00007FF69C7A0000-0x00007FF69FD56000-memory.dmp

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memory/4812-116-0x00007FFA3D590000-0x00007FFA3D5A0000-memory.dmp

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memory/4812-117-0x00007FFA3D590000-0x00007FFA3D5A0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads