guloader | 544d772118922c50b382935f5403c6b9e6fcffdad5a82ea1ad1aec139c138581

Analysis

max time kernel
298s
max time network
299s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
24-10-2024 05:43

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General

Target

5702771896_AWB_20240902_225_20240902.exe
Size

888KB
MD5

fca7c052afe3a4de2e3d0ce5d500932c
SHA1

1873d11a40c7a727762ba70780a43a810f168333
SHA256

f85e3c3cace64f9432cc9588a77cb687cdca8378ec16334923849913632973ce
SHA512

b6cc45932fe3b6f0042e26609ad3a114872f044a667fbcdcd619e01380e03c77f203d88cbce79a09997ad645eb6f1a7d86217c1ec0f0667d8cc995cc28bb988c
SSDEEP

12288:k9QQTGWRJxjcm4Z2dDnD7V1xk3ZCB8w6unDxGlxqHkZ084Y5bzY9n8+q8tiB/h5:FQTGWPxImi21Tx1J6uDxaxqHg7098+6n

Score

10^/10

guloader remcos remotehost collection discovery downloader rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

23.227.202.197:2404

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-QPTXAI
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,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Detected Nirsoft tools 8 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral1/memory/1304-34-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/2108-33-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/2108-32-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/1304-31-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/1272-39-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/1272-42-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2108-47-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/1304-54-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1304-34-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral1/memory/1304-31-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral1/memory/1304-54-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2108-33-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/2108-32-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/2108-47-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 2 IoCs

pid	Process
2756	5702771896_AWB_20240902_225_20240902.exe
2756	5702771896_AWB_20240902_225_20240902.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	5702771896_AWB_20240902_225_20240902.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2652	5702771896_AWB_20240902_225_20240902.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2756	5702771896_AWB_20240902_225_20240902.exe
2652	5702771896_AWB_20240902_225_20240902.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2756 set thread context of 2652	2756	5702771896_AWB_20240902_225_20240902.exe	30
PID 2652 set thread context of 2108	2652	5702771896_AWB_20240902_225_20240902.exe	32
PID 2652 set thread context of 1304	2652	5702771896_AWB_20240902_225_20240902.exe	33
PID 2652 set thread context of 1272	2652	5702771896_AWB_20240902_225_20240902.exe	34

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 5 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	5702771896_AWB_20240902_225_20240902.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5702771896_AWB_20240902_225_20240902.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5702771896_AWB_20240902_225_20240902.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5702771896_AWB_20240902_225_20240902.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5702771896_AWB_20240902_225_20240902.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2108	5702771896_AWB_20240902_225_20240902.exe
2108	5702771896_AWB_20240902_225_20240902.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
2756	5702771896_AWB_20240902_225_20240902.exe
2652	5702771896_AWB_20240902_225_20240902.exe
2652	5702771896_AWB_20240902_225_20240902.exe
2652	5702771896_AWB_20240902_225_20240902.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1272	5702771896_AWB_20240902_225_20240902.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2652	5702771896_AWB_20240902_225_20240902.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2756 wrote to memory of 2652	2756	5702771896_AWB_20240902_225_20240902.exe	30
PID 2756 wrote to memory of 2652	2756	5702771896_AWB_20240902_225_20240902.exe	30
PID 2756 wrote to memory of 2652	2756	5702771896_AWB_20240902_225_20240902.exe	30
PID 2756 wrote to memory of 2652	2756	5702771896_AWB_20240902_225_20240902.exe	30
PID 2756 wrote to memory of 2652	2756	5702771896_AWB_20240902_225_20240902.exe	30
PID 2756 wrote to memory of 2652	2756	5702771896_AWB_20240902_225_20240902.exe	30
PID 2652 wrote to memory of 2108	2652	5702771896_AWB_20240902_225_20240902.exe	32
PID 2652 wrote to memory of 2108	2652	5702771896_AWB_20240902_225_20240902.exe	32
PID 2652 wrote to memory of 2108	2652	5702771896_AWB_20240902_225_20240902.exe	32
PID 2652 wrote to memory of 2108	2652	5702771896_AWB_20240902_225_20240902.exe	32
PID 2652 wrote to memory of 1304	2652	5702771896_AWB_20240902_225_20240902.exe	33
PID 2652 wrote to memory of 1304	2652	5702771896_AWB_20240902_225_20240902.exe	33
PID 2652 wrote to memory of 1304	2652	5702771896_AWB_20240902_225_20240902.exe	33
PID 2652 wrote to memory of 1304	2652	5702771896_AWB_20240902_225_20240902.exe	33
PID 2652 wrote to memory of 1272	2652	5702771896_AWB_20240902_225_20240902.exe	34
PID 2652 wrote to memory of 1272	2652	5702771896_AWB_20240902_225_20240902.exe	34
PID 2652 wrote to memory of 1272	2652	5702771896_AWB_20240902_225_20240902.exe	34
PID 2652 wrote to memory of 1272	2652	5702771896_AWB_20240902_225_20240902.exe	34

C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe
"C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2756
- C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe
  "C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2652
- - C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe
    C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe /stext "C:\Users\Admin\AppData\Local\Temp\fusngzvyedgexbkwpgap"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:2108
- - C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe
    C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe /stext "C:\Users\Admin\AppData\Local\Temp\qwfxhkfaslyjzpghyqnqslp"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:1304
- - C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe
    C:\Users\Admin\AppData\Local\Temp\5702771896_AWB_20240902_225_20240902.exe /stext "C:\Users\Admin\AppData\Local\Temp\sqlqicquntqwjvulpbzkvykgtq"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
bf70c538372bea698c8ee68784f944fe

SHA1
30e7b529fa307e23d690838c25c07551534316cf

SHA256
ffb690fcccbfd22df99a2d339841b9eb11824d640abeaa26e2cd418dca99fce6

SHA512
2c0e7554dd4ecedc37b530b4b6a83f2b0eb155f1a293223267a957fdc6e2fe03757eb0a4819c7ac10489e38491c1bdb27784b6ab148d3abea9fd34478012908c

Download Submit
C:\Users\Admin\AppData\Local\Temp\fusngzvyedgexbkwpgap

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
\Users\Admin\AppData\Local\Temp\nstF4AD.tmp\System.dll

Filesize
11KB

MD5
9625d5b1754bc4ff29281d415d27a0fd

SHA1
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0

SHA256
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448

SHA512
dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b

Download Submit
memory/1272-36-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-42-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-39-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-38-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-37-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1304-54-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1304-29-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1304-27-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1304-34-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1304-31-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2108-26-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2108-33-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2108-32-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2108-35-0x00000000773E0000-0x0000000077589000-memory.dmp

Filesize
1.7MB

Download
memory/2108-30-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2108-47-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2652-59-0x0000000031F70000-0x0000000031F89000-memory.dmp

Filesize
100KB

Download
memory/2652-82-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-20-0x00000000773E0000-0x0000000077589000-memory.dmp

Filesize
1.7MB

Download
memory/2652-142-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-50-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-139-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-55-0x0000000031F70000-0x0000000031F89000-memory.dmp

Filesize
100KB

Download
memory/2652-136-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-58-0x0000000031F70000-0x0000000031F89000-memory.dmp

Filesize
100KB

Download
memory/2652-61-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-64-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-133-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-67-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-70-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-73-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-76-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-79-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-21-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-85-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-88-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-91-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-100-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-103-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-106-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-109-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-112-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-118-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-121-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-124-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-127-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2652-130-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2756-16-0x0000000003EC0000-0x0000000004E5E000-memory.dmp

Filesize
15.6MB

Download
memory/2756-18-0x00000000773E0000-0x0000000077589000-memory.dmp

Filesize
1.7MB

Download
memory/2756-17-0x00000000773E1000-0x00000000774E2000-memory.dmp

Filesize
1.0MB

Download
memory/2756-19-0x0000000003EC0000-0x0000000004E5E000-memory.dmp

Filesize
15.6MB

Download