guloader | 36bd481c4fa0c81766a46d47dc47bd538c2bbf91254092fe6f5cbea1d3bcb4d2

General

Target

documents 53 ACH 775-53 ABM 912.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:

documents 53 ACH 775-53 ABM 912.exe

pid process

2656 documents 53 ACH 775-53 ABM 912.exe

pid	process
2656	documents 53 ACH 775-53 ABM 912.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-1-5-21-3803511929-1339359695-2191195476-1000\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

25 drive.google.com
26 drive.google.com

flow	ioc
25	drive.google.com
26	drive.google.com

Drops file in System32 directory 2 IoCs

Processes:

documents 53 ACH 775-53 ABM 912.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\lohoch.gim	documents 53 ACH 775-53 ABM 912.exe
File opened for modification	C:\Windows\SysWOW64\threshes.uds	documents 53 ACH 775-53 ABM 912.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

Processes:

wab.exe

pid process

5384 wab.exe
5384 wab.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

documents 53 ACH 775-53 ABM 912.exewab.exe

pid process

2656 documents 53 ACH 775-53 ABM 912.exe
5384 wab.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

documents 53 ACH 775-53 ABM 912.exe

description pid process target process

PID 2656 set thread context of 5384 2656 documents 53 ACH 775-53 ABM 912.exe wab.exe
Drops file in Program Files directory 1 IoCs

Processes:

documents 53 ACH 775-53 ABM 912.exe

description ioc process

File opened for modification C:\Program Files (x86)\Common Files\forbandelsernes\kln.lio documents 53 ACH 775-53 ABM 912.exe

pid	process
5384	wab.exe
5384	wab.exe

pid	process
2656	documents 53 ACH 775-53 ABM 912.exe
5384	wab.exe

description	pid	process	target process
PID 2656 set thread context of 5384	2656	documents 53 ACH 775-53 ABM 912.exe	wab.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Common Files\forbandelsernes\kln.lio	documents 53 ACH 775-53 ABM 912.exe

Drops file in Windows directory 3 IoCs

Processes:

documents 53 ACH 775-53 ABM 912.exe

description	ioc	process
File opened for modification	C:\Windows\resources\0409\enchasing.Pet	documents 53 ACH 775-53 ABM 912.exe
File opened for modification	C:\Windows\Fonts\Forters67\Elektrotekniker.wra	documents 53 ACH 775-53 ABM 912.exe
File opened for modification	C:\Windows\Tnkepauses.tro	documents 53 ACH 775-53 ABM 912.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:

documents 53 ACH 775-53 ABM 912.exe

pid process

2656 documents 53 ACH 775-53 ABM 912.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

wab.exe

pid process

5384 wab.exe

pid	process
2656	documents 53 ACH 775-53 ABM 912.exe

pid	process
5384	wab.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

documents 53 ACH 775-53 ABM 912.exe

description	pid	process	target process
PID 2656 wrote to memory of 5384	2656	documents 53 ACH 775-53 ABM 912.exe	wab.exe
PID 2656 wrote to memory of 5384	2656	documents 53 ACH 775-53 ABM 912.exe	wab.exe
PID 2656 wrote to memory of 5384	2656	documents 53 ACH 775-53 ABM 912.exe	wab.exe
PID 2656 wrote to memory of 5384	2656	documents 53 ACH 775-53 ABM 912.exe	wab.exe
PID 2656 wrote to memory of 5384	2656	documents 53 ACH 775-53 ABM 912.exe	wab.exe

C:\Users\Admin\AppData\Local\Temp\documents 53 ACH 775-53 ABM 912.exe
"C:\Users\Admin\AppData\Local\Temp\documents 53 ACH 775-53 ABM 912.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:2656

C:\Program Files (x86)\windows mail\wab.exe
"C:\Users\Admin\AppData\Local\Temp\documents 53 ACH 775-53 ABM 912.exe"
2⤵
- Adds Run key to start application
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetWindowsHookEx
PID:5384

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1

T1102

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsn4D08.tmp\System.dll
Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
memory/2656-24-0x00000000053C0000-0x000000000604F000-memory.dmp

Filesize
12.6MB

Download
memory/2656-19-0x00000000053C0000-0x000000000604F000-memory.dmp

Filesize
12.6MB

Download
memory/2656-20-0x00000000773E1000-0x0000000077501000-memory.dmp

Filesize
1.1MB

Download
memory/2656-21-0x0000000010000000-0x0000000010006000-memory.dmp

Filesize
24KB

Download
memory/5384-49-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-53-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-25-0x00000000773E1000-0x0000000077501000-memory.dmp

Filesize
1.1MB

Download
memory/5384-39-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-41-0x00000000773E1000-0x0000000077501000-memory.dmp

Filesize
1.1MB

Download
memory/5384-40-0x0000000002460000-0x00000000030EF000-memory.dmp

Filesize
12.6MB

Download
memory/5384-42-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-43-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-44-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-45-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-46-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-47-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-48-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-22-0x0000000002460000-0x00000000030EF000-memory.dmp

Filesize
12.6MB

Download
memory/5384-50-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-51-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-52-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-23-0x0000000077468000-0x0000000077469000-memory.dmp

Filesize
4KB

Download
memory/5384-54-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-55-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-56-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-57-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-58-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-59-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-60-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-61-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-62-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-63-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-64-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-65-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-66-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-67-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download
memory/5384-68-0x0000000001200000-0x0000000002454000-memory.dmp

Filesize
18.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads