guloader | 915903938dd1c51abd0f1e2f35e0fca67040694d9f5b1edd5825533a70a7269f

General

Target

PO_203-25.exe
Size

1.1MB
MD5

bcf1b4c359d89892cbdeddcac52fd4d7
SHA1

3c12d1efe6438fed0bcec88c23c5994c44066e43
SHA256

915903938dd1c51abd0f1e2f35e0fca67040694d9f5b1edd5825533a70a7269f
SHA512

8d7537428ac645f0e9211f0d2efb96b038901d9937c25426c6d518300a405389ec85e8ebe612c980fa1f8af53d618c29ef1b415bf645959b858acbc92cde48e9
SSDEEP

12288:DYT2LK1jMVzATVewPQGKYkDWpktoYH3gUOQe7Vt8js7o8ucQPiEC6A:DYT2QMVzATgGKYkLoYXgLTE8ucQPi/6A

Score

10^/10

guloader remcos remotehost discovery downloader rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

192.3.176.134:7062

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-9BZQTI
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos
Loads dropped DLL 1 IoCs

Processes:

PO_203-25.exe

pid process

2960 PO_203-25.exe
Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

Processes:

PO_203-25.exe

pid process

2228 PO_203-25.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

PO_203-25.exePO_203-25.exe

pid process

2960 PO_203-25.exe
2228 PO_203-25.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

PO_203-25.exe

description pid process target process

PID 2960 set thread context of 2228 2960 PO_203-25.exe PO_203-25.exe
Drops file in Program Files directory 1 IoCs

Processes:

PO_203-25.exe

description ioc process

File opened for modification C:\Program Files (x86)\Unfurnish208.est PO_203-25.exe
Drops file in Windows directory 1 IoCs

Processes:

PO_203-25.exe

description ioc process

File opened for modification C:\Windows\Fonts\randbetingelsens\filbetegnelse.evn PO_203-25.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2960	PO_203-25.exe

pid	process
2228	PO_203-25.exe

pid	process
2960	PO_203-25.exe
2228	PO_203-25.exe

description	pid	process	target process
PID 2960 set thread context of 2228	2960	PO_203-25.exe	PO_203-25.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Unfurnish208.est	PO_203-25.exe

description	ioc	process
File opened for modification	C:\Windows\Fonts\randbetingelsens\filbetegnelse.evn	PO_203-25.exe

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

Processes:

PO_203-25.exePO_203-25.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PO_203-25.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PO_203-25.exe

Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

PO_203-25.exe

pid process

2960 PO_203-25.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

PO_203-25.exe

pid process

2228 PO_203-25.exe

pid	process
2960	PO_203-25.exe

pid	process
2228	PO_203-25.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

PO_203-25.exe

description	pid	process	target process
PID 2960 wrote to memory of 2228	2960	PO_203-25.exe	PO_203-25.exe
PID 2960 wrote to memory of 2228	2960	PO_203-25.exe	PO_203-25.exe
PID 2960 wrote to memory of 2228	2960	PO_203-25.exe	PO_203-25.exe
PID 2960 wrote to memory of 2228	2960	PO_203-25.exe	PO_203-25.exe
PID 2960 wrote to memory of 2228	2960	PO_203-25.exe	PO_203-25.exe
PID 2960 wrote to memory of 2228	2960	PO_203-25.exe	PO_203-25.exe

C:\Users\Admin\AppData\Local\Temp\PO_203-25.exe
"C:\Users\Admin\AppData\Local\Temp\PO_203-25.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2960
- C:\Users\Admin\AppData\Local\Temp\PO_203-25.exe
  "C:\Users\Admin\AppData\Local\Temp\PO_203-25.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:2228

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

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
b9965b744c932ae5aacde7b584293140

SHA1
5070424d71cab91a7f7159bdae54385193f9a5e4

SHA256
6df1ad4cc209d502c2de3cbc6471db31799bb8b66e9e568593e47744702e82c0

SHA512
44b893f9a3809096fa3fcdb483aeac453e4f5b05fe4a43cea52f0794d34bbf497f611e77f7f2031ee2990327073ecb3b3ee0f65f4a744088ca7cd086aaeb3c65

Download Submit
\Users\Admin\AppData\Local\Temp\nsd9D2B.tmp\System.dll

Filesize
11KB

MD5
375e8a08471dc6f85f3828488b1147b3

SHA1
1941484ac710fc301a7d31d6f1345e32a21546af

SHA256
4c86b238e64ecfaabe322a70fd78db229a663ccc209920f3385596a6e3205f78

SHA512
5ba29db13723ddf27b265a4548606274b850d076ae1f050c64044f8ccd020585ad766c85c3e20003a22f356875f76fb3679c89547b0962580d8e5a42b082b9a8

Download Submit
memory/2228-57-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-42-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-16-0x00000000772F0000-0x0000000077499000-memory.dmp

Filesize
1.7MB

Download
memory/2228-74-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-33-0x00000000772F0000-0x0000000077499000-memory.dmp

Filesize
1.7MB

Download
memory/2228-32-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-36-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-66-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-45-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-72-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-48-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-51-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-53-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-69-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-60-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2228-63-0x0000000000820000-0x0000000001882000-memory.dmp

Filesize
16.4MB

Download
memory/2960-15-0x00000000772F0000-0x0000000077499000-memory.dmp

Filesize
1.7MB

Download
memory/2960-13-0x0000000003AD0000-0x0000000005B3D000-memory.dmp

Filesize
32.4MB

Download
memory/2960-14-0x00000000772F1000-0x00000000773F2000-memory.dmp

Filesize
1.0MB

Download
memory/2960-17-0x0000000003AD0000-0x0000000005B3D000-memory.dmp

Filesize
32.4MB

Download

Analysis

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