guloader | 3651fbb3c17ca4bc7590476dad23c1fbd773bc3595313d87ac23eff91c203586

General

Target

3035773a6fd96df3c95f7b3c966cc204.exe
Size

431KB
MD5

3035773a6fd96df3c95f7b3c966cc204
SHA1

8edaa8a7551b35e08e4ba8574a29440023813e85
SHA256

3651fbb3c17ca4bc7590476dad23c1fbd773bc3595313d87ac23eff91c203586
SHA512

1fbb1e59e9999bed11f15dace727c745fa788f0d26cf887b924670eead5b1ece5a6ed9c8702f0d83c71734fefd95893bf06fbdb3cb6b52e777ca4ae2c7fa40e7
SSDEEP

12288:AgGlyn9K5Fy1sDLwdr0jD2O7yvZ4Gl1Wb6:AgEUc58sfPjdGuUWb6

Score

10^/10

guloader remcos grace&success discovery downloader persistence rat

Malware Config

Extracted

Family

remcos

Botnet

GRACE&SUCCESS

C2

eweo9264gtuiort.duckdns.org:22740

eweo9264gtuiort.duckdns.org:35966

Attributes

audio_folder
MicRecords
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
true
install_flag
false
keylog_crypt
false
keylog_file
great.dat
keylog_flag
false
keylog_folder
great
mouse_option
false
mutex
Rmc-GEOGQB
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

Loads dropped DLL 2 IoCs

pid	Process
384	3035773a6fd96df3c95f7b3c966cc204.exe
384	3035773a6fd96df3c95f7b3c966cc204.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Genoptrykkes = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Anodise\\Indprentede173.exe"	3035773a6fd96df3c95f7b3c966cc204.exe

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

Web Service

T1102

flow	ioc
21	drive.google.com
20	drive.google.com

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\leiotrichine.cra	3035773a6fd96df3c95f7b3c966cc204.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4168	3035773a6fd96df3c95f7b3c966cc204.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
384	3035773a6fd96df3c95f7b3c966cc204.exe
4168	3035773a6fd96df3c95f7b3c966cc204.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 384 set thread context of 4168	384	3035773a6fd96df3c95f7b3c966cc204.exe	88

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\unneutralize.Exe	3035773a6fd96df3c95f7b3c966cc204.exe
File opened for modification	C:\Program Files (x86)\Common Files\Indhak.non	3035773a6fd96df3c95f7b3c966cc204.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\inspicalr\casimeres.ini	3035773a6fd96df3c95f7b3c966cc204.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	3035773a6fd96df3c95f7b3c966cc204.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3035773a6fd96df3c95f7b3c966cc204.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
384	3035773a6fd96df3c95f7b3c966cc204.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4168	3035773a6fd96df3c95f7b3c966cc204.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 384 wrote to memory of 4168	384	3035773a6fd96df3c95f7b3c966cc204.exe	88
PID 384 wrote to memory of 4168	384	3035773a6fd96df3c95f7b3c966cc204.exe	88
PID 384 wrote to memory of 4168	384	3035773a6fd96df3c95f7b3c966cc204.exe	88
PID 384 wrote to memory of 4168	384	3035773a6fd96df3c95f7b3c966cc204.exe	88
PID 384 wrote to memory of 4168	384	3035773a6fd96df3c95f7b3c966cc204.exe	88

C:\Users\Admin\AppData\Local\Temp\3035773a6fd96df3c95f7b3c966cc204.exe
"C:\Users\Admin\AppData\Local\Temp\3035773a6fd96df3c95f7b3c966cc204.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- 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:384
- C:\Users\Admin\AppData\Local\Temp\3035773a6fd96df3c95f7b3c966cc204.exe
  "C:\Users\Admin\AppData\Local\Temp\3035773a6fd96df3c95f7b3c966cc204.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:4168

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\nssA5B8.tmp\System.dll

Filesize
12KB

MD5
564bb0373067e1785cba7e4c24aab4bf

SHA1
7c9416a01d821b10b2eef97b80899d24014d6fc1

SHA256
7a9ddee34562cd3703f1502b5c70e99cd5bba15de2b6845a3555033d7f6cb2a5

SHA512
22c61a323cb9293d7ec5c7e7e60674d0e2f7b29d55be25eb3c128ea2cd7440a1400cee17c43896b996278007c0d247f331a9b8964e3a40a0eb1404a9596c4472

Download Submit
memory/384-14-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/384-15-0x0000000074085000-0x0000000074086000-memory.dmp

Filesize
4KB

Download
memory/4168-16-0x00000000016F0000-0x0000000004EE9000-memory.dmp

Filesize
56.0MB

Download
memory/4168-17-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/4168-18-0x00000000774B8000-0x00000000774B9000-memory.dmp

Filesize
4KB

Download
memory/4168-19-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/4168-30-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-34-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-38-0x0000000077431000-0x0000000077551000-memory.dmp

Filesize
1.1MB

Download
memory/4168-42-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-43-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-44-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-45-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-46-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-47-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-49-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-50-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/4168-51-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads