nloader | 3ec34f115754827e485cf6eece92db8051fd85c1ebfd104494f5e6c634d07b08

General

Target

詳細情報/詳細情報.xlsb
Size

317KB
MD5

169685039016891f5442292ad95e51c9
SHA1

a2db74f9ab457c403e238cb2410848447f89548e
SHA256

7d1ff39fc6daab153ad6477554415336578256257aa81fd796a48b89c7a8b2e8
SHA512

7c990325b11c661fb3acd7a0f8ed312844b190d3211c2468aa7854271717c9ad96c77dd5e9fcf7042a2e5ce6001d7a6a4edc48265e052d93e128334de4e0e905

Score

10^/10

nloader loader upx

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 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	1084	4720	cmd.exe	67

ACProtect 1.3x - 1.4x DLL software 2 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x0006000000015600-184.dat	acprotect
behavioral2/files/0x0006000000015600-186.dat	acprotect

Nloader Payload 1 IoCs

resource	yara_rule
behavioral2/memory/1548-187-0x0000000010000000-0x0000000010005000-memory.dmp	nloader

Blocklisted process makes network request 1 IoCs

flow	pid	Process
26	1548	rundll32.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x0006000000015600-184.dat	upx
behavioral2/files/0x0006000000015600-186.dat	upx

Loads dropped DLL 1 IoCs

pid	Process
1548	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
4720	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4720	EXCEL.EXE
4720	EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE
4720	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4720 wrote to memory of 1084	4720	EXCEL.EXE	80
PID 4720 wrote to memory of 1084	4720	EXCEL.EXE	80
PID 1084 wrote to memory of 1268	1084	cmd.exe	82
PID 1084 wrote to memory of 1268	1084	cmd.exe	82
PID 1084 wrote to memory of 1536	1084	cmd.exe	83
PID 1084 wrote to memory of 1536	1084	cmd.exe	83
PID 1536 wrote to memory of 1548	1536	rundll32.exe	84
PID 1536 wrote to memory of 1548	1536	rundll32.exe	84
PID 1536 wrote to memory of 1548	1536	rundll32.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\詳細情報\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:4720
- 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:1084
- - C:\Windows\system32\certutil.exe
    certutil -decode C:\Users\Public\14118.doy C:\Users\Public\14118.biy
    3⤵
    PID:1268
- - C:\Windows\system32\rundll32.exe
    rundll32 C:\Users\Public\14118.biy,DF1
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1536
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32 C:\Users\Public\14118.biy,DF1
      4⤵
      Blocklisted process makes network request
      Loads dropped DLL
      PID:1548

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/1548-187-0x0000000010000000-0x0000000010005000-memory.dmp

Filesize
20KB

Download
memory/4720-116-0x00007FF83FDE0000-0x00007FF83FDF0000-memory.dmp

Filesize
64KB

Download
memory/4720-177-0x00007FF83CDC0000-0x00007FF83CDD0000-memory.dmp

Filesize
64KB

Download
memory/4720-123-0x00007FF85E5C0000-0x00007FF8604B5000-memory.dmp

Filesize
31.0MB

Download
memory/4720-121-0x00007FF860650000-0x00007FF86173E000-memory.dmp

Filesize
16.9MB

Download
memory/4720-122-0x00007FF83FDE0000-0x00007FF83FDF0000-memory.dmp

Filesize
64KB

Download
memory/4720-114-0x00007FF6DAB10000-0x00007FF6DE0C6000-memory.dmp

Filesize
53.7MB

Download
memory/4720-117-0x00007FF83FDE0000-0x00007FF83FDF0000-memory.dmp

Filesize
64KB

Download
memory/4720-118-0x00007FF83FDE0000-0x00007FF83FDF0000-memory.dmp

Filesize
64KB

Download
memory/4720-115-0x00007FF83FDE0000-0x00007FF83FDF0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads