guloader | 2cbdaf22b808c1094ce3d8b671444a7a08cff78d65e67170ceab0b2cda1f1423

Analysis

max time kernel
152s
max time network
124s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
14-02-2024 03:38

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General

Target

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
Size

1.1MB
MD5

dbac614bdf786dd5741aaab9ea8006d7
SHA1

4f49b045fe3b043d5f8541939ef66d611094b10d
SHA256

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2
SHA512

966a2038cb16dead59f3b44379d8fb2bb35f5888b10c74cafb8a28b8e9a029b0a5ec0d3c7d17a5915351014c7307e3989efb17120781dccbf7815a00d5789526
SSDEEP

24576:KS5HuM8IqoMzMxDHEHsGhXwy54j3BjqgMQUWhypBR:f55XOHsG/54j3ZftUNBR

Score

10^/10

guloader remcos top downloader persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Top

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
mqerms.dat
keylog_flag
false
keylog_path
%AppData%
mouse_option
false
mutex
alpwovnb-G3F5OR
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 1 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

pid process

236 36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

pid	process
236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

wab.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\samfundshjlper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Wips34\\kronprinserne.exe"	wab.exe

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

Web Service
T1102

Processes:

flow ioc

39 drive.google.com
40 drive.google.com

flow	ioc
39	drive.google.com
40	drive.google.com

Drops file in System32 directory 2 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\lohoch.gim	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
File opened for modification	C:\Windows\SysWOW64\threshes.uds	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

Processes:

wab.exe

pid process

2736 wab.exe
2736 wab.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exewab.exe

pid process

236 36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
2736 wab.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

description pid process target process

PID 236 set thread context of 2736 236 36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe wab.exe

pid	process
2736	wab.exe
2736	wab.exe

pid	process
236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
2736	wab.exe

description	pid	process	target process
PID 236 set thread context of 2736	236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe	wab.exe

Drops file in Program Files directory 1 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Common Files\forbandelsernes\kln.lio	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

Drops file in Windows directory 3 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

description	ioc	process
File opened for modification	C:\Windows\resources\0409\enchasing.Pet	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
File opened for modification	C:\Windows\Fonts\Forters67\Elektrotekniker.wra	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
File opened for modification	C:\Windows\Tnkepauses.tro	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

pid process

236 36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

wab.exe

pid process

2736 wab.exe

pid	process
236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

pid	process
2736	wab.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe

description	pid	process	target process
PID 236 wrote to memory of 2736	236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe	wab.exe
PID 236 wrote to memory of 2736	236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe	wab.exe
PID 236 wrote to memory of 2736	236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe	wab.exe
PID 236 wrote to memory of 2736	236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe	wab.exe
PID 236 wrote to memory of 2736	236	36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe	wab.exe

C:\Users\Admin\AppData\Local\Temp\36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe
"C:\Users\Admin\AppData\Local\Temp\36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.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
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:236

C:\Program Files (x86)\windows mail\wab.exe
"C:\Users\Admin\AppData\Local\Temp\36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2.exe"
2⤵
- Adds Run key to start application
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetWindowsHookEx
PID:2736

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

T1102

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsoC303.tmp\System.dll
Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
memory/236-19-0x00000000053C0000-0x000000000604F000-memory.dmp

Filesize
12.6MB

Download
memory/236-20-0x00000000053C0000-0x000000000604F000-memory.dmp

Filesize
12.6MB

Download
memory/236-21-0x0000000077C21000-0x0000000077D41000-memory.dmp

Filesize
1.1MB

Download
memory/236-22-0x0000000010000000-0x0000000010006000-memory.dmp

Filesize
24KB

Download
memory/2736-23-0x0000000002550000-0x00000000031DF000-memory.dmp

Filesize
12.6MB

Download
memory/2736-24-0x0000000077CA8000-0x0000000077CA9000-memory.dmp

Filesize
4KB

Download
memory/2736-25-0x0000000077C21000-0x0000000077D41000-memory.dmp

Filesize
1.1MB

Download
memory/2736-27-0x0000000002550000-0x00000000031DF000-memory.dmp

Filesize
12.6MB

Download
memory/2736-40-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-41-0x0000000002550000-0x00000000031DF000-memory.dmp

Filesize
12.6MB

Download
memory/2736-42-0x0000000077C21000-0x0000000077D41000-memory.dmp

Filesize
1.1MB

Download
memory/2736-43-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-44-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-45-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-46-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-47-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-48-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-49-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-50-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-51-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-52-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-53-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-54-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-55-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-56-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-57-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-58-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-59-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-60-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-63-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-64-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-65-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-66-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-67-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-68-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-70-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-71-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-72-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-73-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-74-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-75-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-76-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-77-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-78-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-79-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-80-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-81-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-82-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-83-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-84-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-85-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-86-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-87-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-88-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-89-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-90-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-92-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-93-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-94-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-95-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-96-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-98-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-99-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-100-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-101-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download
memory/2736-102-0x00000000012F0000-0x0000000002544000-memory.dmp

Filesize
18.3MB

Download