nloader | db53f42e13d2685bd34dbc5c79fad637c9344e72e210ca05504420874e98c2a6

General

Target

test.xlsb
Size

254KB
MD5

dc37192b5c4c8c4f94c73c18ce5e3829
SHA1

0aa6bb11a11dade2269d90b2781ed0a517362012
SHA256

db53f42e13d2685bd34dbc5c79fad637c9344e72e210ca05504420874e98c2a6
SHA512

3e8b179d8521fb33a46eeeca74bbda7a4e8a32f47b6195b17d62664dd2e31716261a61a495857ed08dbbc001a9eab8adec7133921179eb3df66c53e18c586d9a

Score

10^/10

nloader loader

Malware Config

Extracted

Language

xlm4.0

Source

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 (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	1692	788	cmd.exe	24

Nloader Payload 4 IoCs

resource	yara_rule
behavioral1/memory/960-71-0x0000000000260000-0x0000000000269000-memory.dmp	nloader
behavioral1/memory/960-74-0x0000000000270000-0x0000000000277000-memory.dmp	nloader
behavioral1/memory/960-77-0x00000000002D0000-0x00000000002D5000-memory.dmp	nloader
behavioral1/memory/960-79-0x0000000000250000-0x0000000000256000-memory.dmp	nloader

Loads dropped DLL 1 IoCs

pid	Process
960	rundll32.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1188	960	WerFault.exe	34

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
788	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1188	WerFault.exe
1188	WerFault.exe
1188	WerFault.exe
1188	WerFault.exe
1188	WerFault.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1188	WerFault.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1188	WerFault.exe

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
788	EXCEL.EXE
788	EXCEL.EXE
788	EXCEL.EXE
788	EXCEL.EXE
788	EXCEL.EXE

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 788 wrote to memory of 1692	788	EXCEL.EXE	30
PID 788 wrote to memory of 1692	788	EXCEL.EXE	30
PID 788 wrote to memory of 1692	788	EXCEL.EXE	30
PID 788 wrote to memory of 1692	788	EXCEL.EXE	30
PID 1692 wrote to memory of 564	1692	cmd.exe	32
PID 1692 wrote to memory of 564	1692	cmd.exe	32
PID 1692 wrote to memory of 564	1692	cmd.exe	32
PID 1692 wrote to memory of 564	1692	cmd.exe	32
PID 1692 wrote to memory of 960	1692	cmd.exe	34
PID 1692 wrote to memory of 960	1692	cmd.exe	34
PID 1692 wrote to memory of 960	1692	cmd.exe	34
PID 1692 wrote to memory of 960	1692	cmd.exe	34
PID 1692 wrote to memory of 960	1692	cmd.exe	34
PID 1692 wrote to memory of 960	1692	cmd.exe	34
PID 1692 wrote to memory of 960	1692	cmd.exe	34
PID 960 wrote to memory of 1188	960	rundll32.exe	35
PID 960 wrote to memory of 1188	960	rundll32.exe	35
PID 960 wrote to memory of 1188	960	rundll32.exe	35
PID 960 wrote to memory of 1188	960	rundll32.exe	35

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\test.xlsb
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:788
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c certutil -decode %PUBLIC%\130486.dot %PUBLIC%\130486.pgj && rundll32 %PUBLIC%\130486.pgj,DF1
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:1692
- - C:\Windows\SysWOW64\certutil.exe
    certutil -decode C:\Users\Public\130486.dot C:\Users\Public\130486.pgj
    3⤵
    PID:564
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32 C:\Users\Public\130486.pgj,DF1
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:960
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 960 -s 468
      4⤵
      Program crash
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of AdjustPrivilegeToken
      PID:1188

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/564-65-0x0000000075A71000-0x0000000075A73000-memory.dmp

Filesize
8KB

Download
memory/788-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/788-60-0x000000002F4E1000-0x000000002F4E4000-memory.dmp

Filesize
12KB

Download
memory/788-61-0x00000000711A1000-0x00000000711A3000-memory.dmp

Filesize
8KB

Download
memory/960-71-0x0000000000260000-0x0000000000269000-memory.dmp

Filesize
36KB

Download
memory/960-74-0x0000000000270000-0x0000000000277000-memory.dmp

Filesize
28KB

Download
memory/960-77-0x00000000002D0000-0x00000000002D5000-memory.dmp

Filesize
20KB

Download
memory/960-76-0x0000000000273000-0x0000000000274000-memory.dmp

Filesize
4KB

Download
memory/960-79-0x0000000000250000-0x0000000000256000-memory.dmp

Filesize
24KB

Download
memory/1188-81-0x0000000001C70000-0x0000000001C71000-memory.dmp

Filesize
4KB

Download

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