nloader | 426edb65615875c5f8fd31118142f0b3d2e29b360a7995d69d58803e61c1f81e

General

Target

詳細情報.xlsb
Size

153KB
MD5

cb5a37aac155775daed9abcfd680f39c
SHA1

75cfc87fe3f6f517e684729a558358fd5d492599
SHA256

426edb65615875c5f8fd31118142f0b3d2e29b360a7995d69d58803e61c1f81e
SHA512

cd12773f8a606b0e04e7e02f4b8f1abab1c8efb13008ee6134771954c857f32df6dfd7f74b5a43d206eae40ceac4219e09910c22918a02f2a57e95f747d9b39f

Score

10^/10

nloader loader

Malware Config

Signatures

Nloader
Simple loader that includes the keyword 'cambo' in the URL used to download other families.
loader nloader

Process spawned unexpected child process 2 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	1292	4704	certutil.exe	67
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4012	4704	rundll32.exe	67

Nloader Payload 4 IoCs

resource	yara_rule
behavioral2/memory/4368-13-0x00000000007F0000-0x00000000007F9000-memory.dmp	nloader
behavioral2/memory/4368-14-0x0000000010000000-0x0000000010007000-memory.dmp	nloader
behavioral2/memory/4368-15-0x0000000000AA0000-0x0000000000AA5000-memory.dmp	nloader
behavioral2/memory/4368-16-0x00000000007E0000-0x00000000007E7000-memory.dmp	nloader

Blocklisted process makes network request 1 IoCs

flow	pid	Process
27	4368	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
4368	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
4704	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4704	EXCEL.EXE
4704	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

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

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4704 wrote to memory of 1292	4704	EXCEL.EXE	81
PID 4704 wrote to memory of 1292	4704	EXCEL.EXE	81
PID 4704 wrote to memory of 4012	4704	EXCEL.EXE	84
PID 4704 wrote to memory of 4012	4704	EXCEL.EXE	84
PID 4012 wrote to memory of 4368	4012	rundll32.exe	85
PID 4012 wrote to memory of 4368	4012	rundll32.exe	85
PID 4012 wrote to memory of 4368	4012	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\詳細情報.xlsb"
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\certutil.exe
  "C:\Windows\System32\certutil.exe" -decode C:\Users\Public\jahi1419.png C:\Users\Public\jahi1419.pn
  2⤵
  - Process spawned unexpected child process
  PID:1292
- C:\Windows\System32\rundll32.exe
  "C:\Windows\System32\rundll32.exe" C:\Users\Public\jahi1419.pn,DF j1
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:4012
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\System32\rundll32.exe" C:\Users\Public\jahi1419.pn,DF j1
    3⤵
    - Blocklisted process makes network request
    - Loads dropped DLL
    PID:4368

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/4368-13-0x00000000007F0000-0x00000000007F9000-memory.dmp

Filesize
36KB

Download
memory/4368-14-0x0000000010000000-0x0000000010007000-memory.dmp

Filesize
28KB

Download
memory/4368-15-0x0000000000AA0000-0x0000000000AA5000-memory.dmp

Filesize
20KB

Download
memory/4368-16-0x00000000007E0000-0x00000000007E7000-memory.dmp

Filesize
28KB

Download
memory/4704-6-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download
memory/4704-5-0x00007FF988AF0000-0x00007FF989127000-memory.dmp

Filesize
6.2MB

Download
memory/4704-4-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download
memory/4704-2-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download
memory/4704-3-0x00007FF965210000-0x00007FF965220000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads