nloader | bc64eb93cd133670e5e997bdee03928d2408281ed8f07142ee13371da5352f88

General

Target

subscription_1617898525.xlsb
Size

250KB
MD5

9d39f307b0d6276450038cca7568b2cc
SHA1

72d0c43d84791c50e600d85e6deb2b9021cf7056
SHA256

bc64eb93cd133670e5e997bdee03928d2408281ed8f07142ee13371da5352f88
SHA512

17e98e6da13405142295953f6deb0cd7d44751bf83a22833a7b9747e21ae46630c1edb7d176edcd21f14428182135db181153a06ddd9e3fc70246514f6f1f127

Score

10^/10

nloader loader

Malware Config

Extracted

Language

xlm4.0

Source

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 (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process	532	1244	cmd.exe	24

Nloader Payload 1 IoCs

resource	yara_rule
behavioral1/memory/1932-70-0x00000000000E0000-0x00000000000E5000-memory.dmp	nloader

Blocklisted process makes network request 2 IoCs

flow	pid	Process
4	1932	rundll32.exe
5	1932	rundll32.exe

Executes dropped EXE 1 IoCs

pid	Process
1540	huqgk.exe

Loads dropped DLL 3 IoCs

pid	Process
1932	rundll32.exe
1932	rundll32.exe
1932	rundll32.exe

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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1244	EXCEL.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1244	EXCEL.EXE
1244	EXCEL.EXE
1244	EXCEL.EXE

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1244 wrote to memory of 532	1244	EXCEL.EXE	30
PID 1244 wrote to memory of 532	1244	EXCEL.EXE	30
PID 1244 wrote to memory of 532	1244	EXCEL.EXE	30
PID 1244 wrote to memory of 532	1244	EXCEL.EXE	30
PID 532 wrote to memory of 328	532	cmd.exe	32
PID 532 wrote to memory of 328	532	cmd.exe	32
PID 532 wrote to memory of 328	532	cmd.exe	32
PID 532 wrote to memory of 328	532	cmd.exe	32
PID 532 wrote to memory of 1932	532	cmd.exe	34
PID 532 wrote to memory of 1932	532	cmd.exe	34
PID 532 wrote to memory of 1932	532	cmd.exe	34
PID 532 wrote to memory of 1932	532	cmd.exe	34
PID 532 wrote to memory of 1932	532	cmd.exe	34
PID 532 wrote to memory of 1932	532	cmd.exe	34
PID 532 wrote to memory of 1932	532	cmd.exe	34
PID 1932 wrote to memory of 1540	1932	rundll32.exe	35
PID 1932 wrote to memory of 1540	1932	rundll32.exe	35
PID 1932 wrote to memory of 1540	1932	rundll32.exe	35
PID 1932 wrote to memory of 1540	1932	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\subscription_1617898525.xlsb
1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1244
- C:\Windows\SysWOW64\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:532
- - C:\Windows\SysWOW64\certutil.exe
    certutil -decode C:\Users\Public\14118.doy C:\Users\Public\14118.biy
    3⤵
    PID:328
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32 C:\Users\Public\14118.biy,DF1
    3⤵
    - Blocklisted process makes network request
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:1932
  - - C:\ProgramData\huqgk\huqgk.exe
      "C:\ProgramData\huqgk\huqgk.exe"
      4⤵
      Executes dropped EXE
      PID:1540

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/328-64-0x0000000075C31000-0x0000000075C33000-memory.dmp

Filesize
8KB

Download
memory/1244-59-0x000000002F5C1000-0x000000002F5C4000-memory.dmp

Filesize
12KB

Download
memory/1244-61-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1244-60-0x0000000071D11000-0x0000000071D13000-memory.dmp

Filesize
8KB

Download
memory/1932-70-0x00000000000E0000-0x00000000000E5000-memory.dmp

Filesize
20KB

Download

Analysis

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