nloader | 720ac949e6743c94b40a02c010489f57696122431ccd4d9ab7a3eee00b8f7a77

General

Target

B06CO4I2G0u642m5Gi6R.xlsb
Size

327KB
MD5

11ae52bd9c6a338582892d1a0e565269
SHA1

3b29f297c2abe8208da5071724db6361348d0d17
SHA256

720ac949e6743c94b40a02c010489f57696122431ccd4d9ab7a3eee00b8f7a77
SHA512

af8b710f2ef8b0edc2b97930cbc703bb08497c961b34357fb0b6895108de16e53d3fe936357cea2fc907c444256868ec71b5959c6bd933d60bb07053a094b4d7

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	1844	1456	cmd.exe	67

ACProtect 1.3x - 1.4x DLL software 2 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000100000001ab65-183.dat	acprotect
behavioral2/files/0x000100000001ab65-185.dat	acprotect

Nloader Payload 1 IoCs

resource	yara_rule
behavioral2/memory/1244-186-0x0000000010000000-0x0000000010005000-memory.dmp	nloader

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000100000001ab65-183.dat	upx
behavioral2/files/0x000100000001ab65-185.dat	upx

Loads dropped DLL 1 IoCs

pid	Process
1244	rundll32.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4168	1244	WerFault.exe	86

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
1456	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe
4168	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	4168	WerFault.exe
Token: SeBackupPrivilege	4168	WerFault.exe
Token: SeDebugPrivilege	4168	WerFault.exe

Suspicious use of SetWindowsHookEx 17 IoCs

pid	Process
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1456 wrote to memory of 1844	1456	EXCEL.EXE	81
PID 1456 wrote to memory of 1844	1456	EXCEL.EXE	81
PID 1844 wrote to memory of 2840	1844	cmd.exe	83
PID 1844 wrote to memory of 2840	1844	cmd.exe	83
PID 1844 wrote to memory of 2300	1844	cmd.exe	85
PID 1844 wrote to memory of 2300	1844	cmd.exe	85
PID 2300 wrote to memory of 1244	2300	rundll32.exe	86
PID 2300 wrote to memory of 1244	2300	rundll32.exe	86
PID 2300 wrote to memory of 1244	2300	rundll32.exe	86

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\B06CO4I2G0u642m5Gi6R.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1456
- 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:1844
- - C:\Windows\system32\certutil.exe
    certutil -f -decode C:\Users\Public\42237.j56 C:\Users\Public\42237.h5
    3⤵
    PID:2840
- - C:\Windows\system32\rundll32.exe
    rundll32 C:\Users\Public\42237.h5,DF
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2300
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32 C:\Users\Public\42237.h5,DF
      4⤵
      Loads dropped DLL
      PID:1244
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 1244 -s 792
        5⤵
        Program crash
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4168

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

Replay Monitor

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Downloads

memory/1244-186-0x0000000010000000-0x0000000010005000-memory.dmp

Filesize
20KB

Download
memory/1456-118-0x00007FF882460000-0x00007FF882470000-memory.dmp

Filesize
64KB

Download
memory/1456-122-0x00007FF8A2A90000-0x00007FF8A3B7E000-memory.dmp

Filesize
16.9MB

Download
memory/1456-123-0x00007FF8A0B90000-0x00007FF8A2A85000-memory.dmp

Filesize
31.0MB

Download
memory/1456-121-0x00007FF882460000-0x00007FF882470000-memory.dmp

Filesize
64KB

Download
memory/1456-114-0x00007FF6DFAC0000-0x00007FF6E3076000-memory.dmp

Filesize
53.7MB

Download
memory/1456-117-0x00007FF882460000-0x00007FF882470000-memory.dmp

Filesize
64KB

Download
memory/1456-116-0x00007FF882460000-0x00007FF882470000-memory.dmp

Filesize
64KB

Download
memory/1456-115-0x00007FF882460000-0x00007FF882470000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads