guloader | 24843276944661cf3b13a9297843687f6b6fa1111d51bca9d73c45fa35bc4c7a

General

Target

Payment copy.vbs
Size

1.6MB
MD5

237ab08466bfa23450bb6266af82667f
SHA1

a82af4e2d1367d941bf7576a83219dc4ef0b6f99
SHA256

24843276944661cf3b13a9297843687f6b6fa1111d51bca9d73c45fa35bc4c7a
SHA512

03bab4a6f5797169fbee90def5f4c51a02f8725afb45a090f53fc3f20d395438a82812b30bd81d24129024142ff3b1c39c2b77c1d7931a02cf5899df72953b71
SSDEEP

24576:2Eeps6dHJFR2QlXTu3AoZBn7aw6ccWtxSX3KAHSh:0s6dt8x7r5cI

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Executes dropped EXE 1 IoCs

pid	Process
2768	temp_executable.exe

Loads dropped DLL 3 IoCs

pid	Process
2768	temp_executable.exe
2768	temp_executable.exe
2476	temp_executable.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2768	temp_executable.exe
2476	temp_executable.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2768 set thread context of 2476	2768	temp_executable.exe	31

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\sorteringsordenens.lnk	temp_executable.exe
File opened for modification	C:\Program Files (x86)\sorteringsordenens.lnk	temp_executable.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	temp_executable.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	temp_executable.exe

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral1/files/0x000700000001211a-4.dat	nsis_installer_1
behavioral1/files/0x000700000001211a-4.dat	nsis_installer_2

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2768	temp_executable.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2080 wrote to memory of 2768	2080	WScript.exe	30
PID 2080 wrote to memory of 2768	2080	WScript.exe	30
PID 2080 wrote to memory of 2768	2080	WScript.exe	30
PID 2080 wrote to memory of 2768	2080	WScript.exe	30
PID 2768 wrote to memory of 2476	2768	temp_executable.exe	31
PID 2768 wrote to memory of 2476	2768	temp_executable.exe	31
PID 2768 wrote to memory of 2476	2768	temp_executable.exe	31
PID 2768 wrote to memory of 2476	2768	temp_executable.exe	31
PID 2768 wrote to memory of 2476	2768	temp_executable.exe	31
PID 2768 wrote to memory of 2476	2768	temp_executable.exe	31

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Payment copy.vbs"
1⤵
- Suspicious use of WriteProcessMemory
PID:2080
- C:\Users\Admin\AppData\Local\Temp\temp_executable.exe
  "C:\Users\Admin\AppData\Local\Temp\temp_executable.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:2768
- - C:\Users\Admin\AppData\Local\Temp\temp_executable.exe
    "C:\Users\Admin\AppData\Local\Temp\temp_executable.exe"
    3⤵
    - Loads dropped DLL
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - System Location Discovery: System Language Discovery
    PID:2476

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

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Program Files (x86)\sorteringsordenens.lnk

Filesize
890B

MD5
e90c93685f022dbe8d9e90d985e7eb90

SHA1
5142af2737f8e26376988288f230c0ade4162050

SHA256
469983e7bc57135e572ebe69c2870b2af9f40acf6c374c8989dca4929ab616c9

SHA512
e1f1421ae48db4a490d04ae5a8bb394191a9d58487d2840246aefc2b74bdd13bde1394c9fb160327cde9d7cf6583430377af075c0ebdde1341cd71050675835f

Download Submit
C:\Users\Admin\AppData\Local\Temp\temp_executable.exe

Filesize
1.0MB

MD5
4648a0278bd003c324fcd7e7779dcf99

SHA1
401623540094e2eef531d366d8c155c1d3d72abb

SHA256
49260a07ff0d5c06efdfc3985bcc44d6df5cf2a56810f01c3243684b950264cc

SHA512
198d5db4bb4f612645786c27cdacb26665db4099cd8580091adf86d9d84fc16278d3a87c410912cb4968c630dca1cc14432551673fb7653ad83f28b601720da5

Download Submit
\Users\Admin\AppData\Local\Temp\nso23C7.tmp\System.dll

Filesize
11KB

MD5
a436db0c473a087eb61ff5c53c34ba27

SHA1
65ea67e424e75f5065132b539c8b2eda88aa0506

SHA256
75ed40311875312617d6711baed0be29fcaee71031ca27a8d308a72b15a51e49

SHA512
908f46a855480af6eacb2fb64de0e60b1e04bbb10b23992e2cf38a4cbebdcd7d3928c4c022d7ad9f7479265a8f426b93eef580afec95570e654c360d62f5e08d

Download Submit
memory/2476-294-0x0000000001520000-0x0000000002C85000-memory.dmp

Filesize
23.4MB

Download
memory/2476-296-0x00000000004B0000-0x0000000001512000-memory.dmp

Filesize
16.4MB

Download
memory/2768-289-0x0000000002DE0000-0x0000000004545000-memory.dmp

Filesize
23.4MB

Download
memory/2768-290-0x0000000076F41000-0x0000000077042000-memory.dmp

Filesize
1.0MB

Download
memory/2768-292-0x0000000002DE0000-0x0000000004545000-memory.dmp

Filesize
23.4MB

Download
memory/2768-291-0x0000000076F40000-0x00000000770E9000-memory.dmp

Filesize
1.7MB

Download
memory/2768-302-0x0000000002DE0000-0x0000000004545000-memory.dmp

Filesize
23.4MB

Download

Analysis

Sharing