nloader | 50bb137dc5dc91ece4a31d01787c0db3361853f2e7b559ff731c05d102bec0ca

Analysis

max time kernel
150s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
27-06-2024 11:22

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General

Target

Users/wilmer.coughlin/Downloads/subscription_1617056233.xlsb
Size

177KB
MD5

1d1ba411ff36cdd1b1350341624ac008
SHA1

becdec14b92c6d67b3aa28fdbf4293dabb7b0055
SHA256

ae6dbc08e0e21b217352175f916cfd5269c4fd8d5de6bff2d0a93a366f78e8d1
SHA512

89a9df6e41300e05c71af3eb45acd7cd6c3915bc511d00cc2a420c5d3a274a704798b3e48e93ffccd7813ee2a25e96a2c1c1f4d1e84ed86c144f2e79af501ef0
SSDEEP

3072:jMozgZ9S08bSe71IeyGJE+pCm7nXEMyQuvYKrp/wR+bhzKbzvXAJ732:TgLSPB76eyGjwm75yQuvPSjwJr2

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 2 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

cmd.exerundll32.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4508	1052	cmd.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3616	1052	rundll32.exe	EXCEL.EXE

Nloader payload 3 IoCs

Processes:

resource	yara_rule
behavioral10/memory/420-82-0x00000000013A0000-0x00000000013A9000-memory.dmp	nloader
behavioral10/memory/420-85-0x0000000001530000-0x0000000001537000-memory.dmp	nloader
behavioral10/memory/420-88-0x0000000001550000-0x0000000001555000-memory.dmp	nloader

Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

420 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

4168 420 WerFault.exe rundll32.exe

pid	process
420	rundll32.exe

pid	pid_target	process	target process
4168	420	WerFault.exe	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

Processes:

EXCEL.EXE

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

Processes:

EXCEL.EXE

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

Processes:

EXCEL.EXE

pid process

1052 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE
1052	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

EXCEL.EXEcmd.exerundll32.exe

description	pid	process	target process
PID 1052 wrote to memory of 4508	1052	EXCEL.EXE	cmd.exe
PID 1052 wrote to memory of 4508	1052	EXCEL.EXE	cmd.exe
PID 4508 wrote to memory of 4044	4508	cmd.exe	certutil.exe
PID 4508 wrote to memory of 4044	4508	cmd.exe	certutil.exe
PID 1052 wrote to memory of 3616	1052	EXCEL.EXE	rundll32.exe
PID 1052 wrote to memory of 3616	1052	EXCEL.EXE	rundll32.exe
PID 3616 wrote to memory of 420	3616	rundll32.exe	rundll32.exe
PID 3616 wrote to memory of 420	3616	rundll32.exe	rundll32.exe
PID 3616 wrote to memory of 420	3616	rundll32.exe	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Users\wilmer.coughlin\Downloads\subscription_1617056233.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1052

C:\Windows\SYSTEM32\cmd.exe
cmd.exe /c certutil -decode %PUBLIC%\4123.xsg %PUBLIC%\4123.do1
2⤵
- Process spawned unexpected child process
- Suspicious use of WriteProcessMemory
PID:4508

C:\Windows\system32\certutil.exe
certutil -decode C:\Users\Public\4123.xsg C:\Users\Public\4123.do1
3⤵
PID:4044

C:\Windows\SYSTEM32\rundll32.exe
rundll32 C:\Users\Public\4123.do1,DF1
2⤵
- Process spawned unexpected child process
- Suspicious use of WriteProcessMemory
PID:3616

C:\Windows\SysWOW64\rundll32.exe
rundll32 C:\Users\Public\4123.do1,DF1
3⤵
- Loads dropped DLL
PID:420

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 420 -s 916
4⤵
- Program crash
PID:4168

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 420 -ip 420
1⤵
PID:3248

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Office\Recent\index.dat
Filesize
274B

MD5
a188a499da13fb427e5605c4ae483fbb

SHA1
0ce006ddb4ff2493bb8f653cdc3cf19a137c9d1d

SHA256
c2d5c1d3cdf35eda18f430cda01344e15ef0d690585dc997d2a2c5112ef91231

SHA512
d7a0255f1c7a6a0e51f4252a485a8344a1204ba7811b83fc258ed5e2c6aa32e798b61c4a7fddfd11ee27c9a8aa139bb3b8b237071bbc5f40943d86efc9b19dcd

Download Submit
C:\Users\Public\4123.do1
Filesize
48KB

MD5
f776deb4df137b37dcae5406c8f3a07a

SHA1
f6a31b594fca39c118927405fa4d14353b8fd49a

SHA256
93cc5e6a6b671d9b0124ade32ae8b09269de9f03c5c5e66347fbfc7a8c3b305e

SHA512
4077b4214b4683bb4776d470027e61fcc3cb3e78beb9377674e4a4de9115d52911e39cb29a566ab446c6962a252ce01020ffd616b5854a9d8230414262bfafe2

Download Submit
C:\Users\Public\4123.xsg
Filesize
64KB

MD5
c87e1dee1275fed1f7ee813b97ccb17b

SHA1
e8313978e3c0dff6355b843cd470949c719032c6

SHA256
92bb3324b68e8780d718ed808cb9633dc1ef1f7988d2b85cc0f9f431ed63a63d

SHA512
2d2177413ed0767651789363c2b952ff8fba26de6ebb84a6390af6bc87927577bedf08b802f5bd6e937e7462bddbd707100108ccf6ef4f39ded65bdcb8b40f35

Download Submit
memory/420-88-0x0000000001550000-0x0000000001555000-memory.dmp

Filesize
20KB

Download
memory/420-85-0x0000000001530000-0x0000000001537000-memory.dmp

Filesize
28KB

Download
memory/420-82-0x00000000013A0000-0x00000000013A9000-memory.dmp

Filesize
36KB

Download
memory/1052-12-0x00007FFA89490000-0x00007FFA894A0000-memory.dmp

Filesize
64KB

Download
memory/1052-15-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-5-0x00007FFA8BC30000-0x00007FFA8BC40000-memory.dmp

Filesize
64KB

Download
memory/1052-11-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-10-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-9-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-0-0x00007FFA8BC30000-0x00007FFA8BC40000-memory.dmp

Filesize
64KB

Download
memory/1052-14-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-16-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-6-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-13-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-17-0x00007FFA89490000-0x00007FFA894A0000-memory.dmp

Filesize
64KB

Download
memory/1052-18-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-8-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-7-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download
memory/1052-4-0x00007FFA8BC30000-0x00007FFA8BC40000-memory.dmp

Filesize
64KB

Download
memory/1052-3-0x00007FFACBC4D000-0x00007FFACBC4E000-memory.dmp

Filesize
4KB

Download
memory/1052-1-0x00007FFA8BC30000-0x00007FFA8BC40000-memory.dmp

Filesize
64KB

Download
memory/1052-2-0x00007FFA8BC30000-0x00007FFA8BC40000-memory.dmp

Filesize
64KB

Download
memory/1052-96-0x00007FFACBBB0000-0x00007FFACBDA5000-memory.dmp

Filesize
2.0MB

Download