09bf1ebc8306d6fa2539d09b3fdc22429bd2d894fe50c3dcc7e48f51b2f173b4

General

Target
J-1538791023.xlsb
Size 1.2MB
Sample220419-kvfb5seac2
SHA256 bcd3175fd28e63e384b021c6fa9c229a8db4789e84a1dc74339b68593f237b6d
MD5 0aeaad5f5e3e1374760f6669c276b6ec
SHA1 2cb4dd94aa43607252a760a9c2679523781a2ffc
SHA512 223131531e2c68758c5b005e122591b6d4232a317f3b5664a24782c0619dd69306a8d3e788e20658b94c912f9d907c66d9b5e0a706c8d1a37423bca2c5e02bad
MD5 SHA1 SHA512

Score

10^/10

Malware Config

Extracted

Language

xlm4.0

Source

URLs

xlm40.dropper
https://debtsolversuk.co.uk/HLpeQJZi/NbVfNbhn.png
xlm40.dropper
https://pablopereirasilvaluis.com.br/OHTvXEr9c/NbVfNbhn.png
xlm40.dropper
https://portalregionpuno.com/088aFy0Xc8ap/NbVfNbhn.png

Signatures

Process spawned unexpected child process 4 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	2856	3492	Regsvr32.exe	79
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	5056	3492	Regsvr32.exe	79
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4900	3492	Regsvr32.exe	79
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4904	3492	Regsvr32.exe	79

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
3492	EXCEL.EXE

Suspicious use of SetWindowsHookEx 16 IoCs

pid	Process
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE
3492	EXCEL.EXE

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3492 wrote to memory of 2856	3492	EXCEL.EXE	81
PID 3492 wrote to memory of 2856	3492	EXCEL.EXE	81
PID 3492 wrote to memory of 5056	3492	EXCEL.EXE	82
PID 3492 wrote to memory of 5056	3492	EXCEL.EXE	82
PID 3492 wrote to memory of 4900	3492	EXCEL.EXE	83
PID 3492 wrote to memory of 4900	3492	EXCEL.EXE	83
PID 3492 wrote to memory of 4904	3492	EXCEL.EXE	84
PID 3492 wrote to memory of 4904	3492	EXCEL.EXE	84

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\J-1538791023.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3492
- C:\Windows\SYSTEM32\Regsvr32.exe
  Regsvr32 /s calc
  2⤵
  - Process spawned unexpected child process
  PID:2856
- C:\Windows\SYSTEM32\Regsvr32.exe
  Regsvr32 C:\Rfgsg\Jefseg.ooccxx
  2⤵
  - Process spawned unexpected child process
  PID:5056
- C:\Windows\SYSTEM32\Regsvr32.exe
  Regsvr32 C:\Rfgsg\Jefsega.ooccxx
  2⤵
  - Process spawned unexpected child process
  PID:4900
- C:\Windows\SYSTEM32\Regsvr32.exe
  Regsvr32 C:\Rfgsg\Jefsegb.ooccxx
  2⤵
  - Process spawned unexpected child process
  PID:4904

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/3492-130-0x00007FFE5E3D0000-0x00007FFE5E3E0000-memory.dmp

Download

memory/3492-131-0x00007FFE5E3D0000-0x00007FFE5E3E0000-memory.dmp

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memory/3492-132-0x00007FFE5E3D0000-0x00007FFE5E3E0000-memory.dmp

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memory/3492-133-0x00007FFE5E3D0000-0x00007FFE5E3E0000-memory.dmp

Download

memory/3492-134-0x00007FFE5E3D0000-0x00007FFE5E3E0000-memory.dmp

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memory/3492-135-0x00007FFE5C370000-0x00007FFE5C380000-memory.dmp

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memory/3492-136-0x00007FFE5C370000-0x00007FFE5C380000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads