nloader | d51711eecb03950944b65626423e1b36ff93d4852a715f25051cb683a16ff34d

General

Target
隧ｳ邏ｰ諠・ｱ.xlsb
Size 327KB
Sample210503-jagf2d2b76
SHA256 d51711eecb03950944b65626423e1b36ff93d4852a715f25051cb683a16ff34d
MD5 e88b03763c5090769c37e24b58c4b987
SHA1 7bb0453fb4e4b5333fcd78df541ae9a3bd86105d
SHA512 f5ee7ade598a78178eba571c9807f3d835171f4ff9bec2e25d7ab82644279a7b3353d79182aebb243376c6f8b7c30e7d14ab1dc27aaa2decb9580a964ae7557c
MD5 SHA1 SHA512

Score

10^/10

nloader loader upx

Malware Config

Signatures

Nloader
Simple loader that includes the keyword 'campo' 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	3576	4044	cmd.exe	67

ACProtect 1.3x - 1.4x DLL software 2 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000100000001ab3b-183.dat	acprotect
behavioral2/files/0x000100000001ab3b-185.dat	acprotect

Nloader Payload 1 IoCs

resource	yara_rule
behavioral2/memory/3524-186-0x0000000010000000-0x0000000010005000-memory.dmp	nloader

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000100000001ab3b-183.dat	upx
behavioral2/files/0x000100000001ab3b-185.dat	upx

Loads dropped DLL 1 IoCs

pid	Process
3524	rundll32.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1856	3524	WerFault.exe	80

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
4044	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe
1856	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	1856	WerFault.exe
Token: SeBackupPrivilege	1856	WerFault.exe
Token: SeDebugPrivilege	1856	WerFault.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4044	EXCEL.EXE
4044	EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

pid	Process
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE
4044	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4044 wrote to memory of 3576	4044	EXCEL.EXE	75
PID 4044 wrote to memory of 3576	4044	EXCEL.EXE	75
PID 3576 wrote to memory of 1268	3576	cmd.exe	78
PID 3576 wrote to memory of 1268	3576	cmd.exe	78
PID 3576 wrote to memory of 660	3576	cmd.exe	79
PID 3576 wrote to memory of 660	3576	cmd.exe	79
PID 660 wrote to memory of 3524	660	rundll32.exe	80
PID 660 wrote to memory of 3524	660	rundll32.exe	80
PID 660 wrote to memory of 3524	660	rundll32.exe	80

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\隧ｳ邏ｰ諠・ｱ.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:4044
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c certutil -f -decode C:\Users\Public\42237.j56 C:\Users\Public\42237.h5 && rundll32 C:\Users\Public\42237.h5,DF
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:3576
- - C:\Windows\system32\certutil.exe
    certutil -f -decode C:\Users\Public\42237.j56 C:\Users\Public\42237.h5
    3⤵
    PID:1268
- - C:\Windows\system32\rundll32.exe
    rundll32 C:\Users\Public\42237.h5,DF
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:660
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32 C:\Users\Public\42237.h5,DF
      4⤵
      Loads dropped DLL
      PID:3524
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3524 -s 796
        5⤵
        Program crash
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1856

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/3524-186-0x0000000010000000-0x0000000010005000-memory.dmp

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memory/4044-114-0x00007FF7CEBD0000-0x00007FF7D2186000-memory.dmp

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memory/4044-123-0x00007FFB7AAD0000-0x00007FFB7C9C5000-memory.dmp

Download

memory/4044-122-0x00007FFB7C9D0000-0x00007FFB7DABE000-memory.dmp

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memory/4044-121-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/4044-118-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/4044-117-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/4044-116-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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memory/4044-115-0x00007FFB5C580000-0x00007FFB5C590000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads