guloader | b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd

General

Target

b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe
Size

695KB
MD5

7717d53b780cc8a4cbf0934410d995df
SHA1

ca89543dff270cb6f589c49aaf02b8d6566ae2b8
SHA256

b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd
SHA512

fcbdfabd4c5e0ffea81611c0bc7ab029a870b97416f0768cc2d43f24642ed046f7e9b49cf374b1c7371ebe168111feed3712c23c4f413aa0c382e8cc9fb7ba38
SSDEEP

12288:8QszxdK1xIHkD5/wHAlzsyic2NbZWKyWE8N7ccIyJxtDcMdlDjspRaFhCyiNuW:uwcOzsyn25gWfNwcIyJcMd9utsW

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe

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

Web Service

T1102

flow	ioc
4	drive.google.com
5	drive.google.com

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe
2256	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1716 set thread context of 2256	1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe	28

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\brakehand.Inf120	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.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	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1716 wrote to memory of 2256	1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe	28
PID 1716 wrote to memory of 2256	1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe	28
PID 1716 wrote to memory of 2256	1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe	28
PID 1716 wrote to memory of 2256	1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe	28
PID 1716 wrote to memory of 2256	1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe	28
PID 1716 wrote to memory of 2256	1716	b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe	28

C:\Users\Admin\AppData\Local\Temp\b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe
"C:\Users\Admin\AppData\Local\Temp\b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.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:1716
- C:\Users\Admin\AppData\Local\Temp\b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe
  "C:\Users\Admin\AppData\Local\Temp\b7303a968a3a0198dce343fcea8e5e11a9ed7dbf8b7515ec12e15c88ed6b42fd.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:2256

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

\Users\Admin\AppData\Local\Temp\nsy89D9.tmp\System.dll

Filesize
11KB

MD5
4d3b19a81bd51f8ce44b93643a4e3a99

SHA1
35f8b00e85577b014080df98bd2c378351d9b3e9

SHA256
fda0018ab182ac6025d2fc9a2efcce3745d1da21ce5141859f8286cf319a52ce

SHA512
b2ba9c961c0e1617f802990587a9000979ab5cc493ae2f8ca852eb43eeaf24916b0b29057dbff7d41a1797dfb2dce3db41990e8639b8f205771dbec3fd80f622

Download Submit
memory/1716-13-0x00000000034D0000-0x0000000003FD2000-memory.dmp

Filesize
11.0MB

Download
memory/1716-14-0x0000000077281000-0x0000000077382000-memory.dmp

Filesize
1.0MB

Download
memory/1716-15-0x0000000077280000-0x0000000077429000-memory.dmp

Filesize
1.7MB

Download
memory/1716-16-0x00000000034D0000-0x0000000003FD2000-memory.dmp

Filesize
11.0MB

Download
memory/2256-17-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2256-18-0x0000000077280000-0x0000000077429000-memory.dmp

Filesize
1.7MB

Download
memory/2256-39-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download

Analysis

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