guloader | e8b0ae0b538855299301ba758e7064d59a05e75ac8469156dac3cbab4b56c937

General

Target

FACTURA-0055.exe
Size

872KB
MD5

f7a24870d5299a3f89dae6a25c3889a6
SHA1

5e352f6f8fa9eefb48048309daeaf985aeb64321
SHA256

e8b0ae0b538855299301ba758e7064d59a05e75ac8469156dac3cbab4b56c937
SHA512

ee234cac02ed83eed3f82b1707e02c30299a81d12fb02fe119aea512629576ff1bbf160a515e0df117d3ae92fab0956c4e12d4dc2b3a2a45bc239f3e48ecb8e0
SSDEEP

24576:EiGFaq43NvCH2BLmBVfdywujTrlC6hBrlhJ/QOeal:EiGFu3Nv2Vy/dC+FlhJ/qal

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Loads dropped DLL 1 IoCs

pid	Process
4108	FACTURA-0055.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
17	drive.google.com
18	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4348	FACTURA-0055.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4108	FACTURA-0055.exe
4348	FACTURA-0055.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4108 set thread context of 4348	4108	FACTURA-0055.exe	87

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\Arder.lnk	FACTURA-0055.exe
File opened for modification	C:\Windows\resources\0409\figenkaktusses\Ea40.ini	FACTURA-0055.exe
File opened for modification	C:\Windows\Fonts\heraclitic.Wom	FACTURA-0055.exe
File opened for modification	C:\Windows\storsejlenes\blackweed.hor	FACTURA-0055.exe
File opened for modification	C:\Windows\Arder.lnk	FACTURA-0055.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	FACTURA-0055.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	FACTURA-0055.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe
4348	FACTURA-0055.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4108	FACTURA-0055.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4108 wrote to memory of 4348	4108	FACTURA-0055.exe	87
PID 4108 wrote to memory of 4348	4108	FACTURA-0055.exe	87
PID 4108 wrote to memory of 4348	4108	FACTURA-0055.exe	87
PID 4108 wrote to memory of 4348	4108	FACTURA-0055.exe	87
PID 4108 wrote to memory of 4348	4108	FACTURA-0055.exe	87

C:\Users\Admin\AppData\Local\Temp\FACTURA-0055.exe
"C:\Users\Admin\AppData\Local\Temp\FACTURA-0055.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4108
- C:\Users\Admin\AppData\Local\Temp\FACTURA-0055.exe
  "C:\Users\Admin\AppData\Local\Temp\FACTURA-0055.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:4348

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsl9674.tmp\System.dll

Filesize
11KB

MD5
34442e1e0c2870341df55e1b7b3cccdc

SHA1
99b2fa21aead4b6ccd8ff2f6d3d3453a51d9c70c

SHA256
269d232712c86983336badb40b9e55e80052d8389ed095ebf9214964d43b6bb1

SHA512
4a8c57fb12997438b488b862f3fc9dc0f236e07bb47b2bce6053dcb03ac7ad171842f02ac749f02dda4719c681d186330524cd2953d33cb50854844e74b33d51

Download Submit
C:\Windows\Arder.lnk

Filesize
726B

MD5
494254afe484cb2a9846dd9982017355

SHA1
1c4e61a24041dc8acffe778a81ebbb1cfd76a18d

SHA256
60b1692d995fb102bbd864cd082e8703ec3151df4fcdae2526c6e133e15a19dd

SHA512
d8bd73c7809fd9365db9590ddd11f453c746f957ae096ca9da7fd5c7892ff77d9eeb06ee85a20aa84688ad5460c960ffdc54b0dd14534a89ede5c4ec9315a5ee

Download Submit
memory/4108-279-0x00000000029B0000-0x0000000004B2E000-memory.dmp

Filesize
33.5MB

Download
memory/4108-280-0x00000000029B0000-0x0000000004B2E000-memory.dmp

Filesize
33.5MB

Download
memory/4108-283-0x00000000749C0000-0x00000000749C6000-memory.dmp

Filesize
24KB

Download
memory/4108-282-0x00000000749C4000-0x00000000749C5000-memory.dmp

Filesize
4KB

Download
memory/4108-281-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/4108-299-0x00000000029B0000-0x0000000004B2E000-memory.dmp

Filesize
33.5MB

Download
memory/4348-285-0x0000000001660000-0x00000000037DE000-memory.dmp

Filesize
33.5MB

Download
memory/4348-298-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4348-284-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4348-300-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4348-301-0x0000000001660000-0x00000000037DE000-memory.dmp

Filesize
33.5MB

Download
memory/4348-302-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/4348-303-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4348-304-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4348-307-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download

Analysis

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