guloader | bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17

General

Target

bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe
Size

595KB
MD5

dd009056ed546d7cb3b75ef74f748ced
SHA1

39fa6f07ceaf1d545c02702a18dcacc5c57acf0a
SHA256

bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17
SHA512

e93e2802c0b8dab4a384bfdb5d54191438e21d1c7f0228c6f92b0382562d9948869f4ef4610d595e8775556197e4ae68f3e9dc35d6e82495cbc8976655a5ab2b
SSDEEP

12288:UnPdM9EEXsp0807Vhc7PWf/EdNjxwxNkecc9waDhWC8muW:EPdM20/77cbc/Ezs9wgtuW

Score

10^/10

guloader latentbot remcos manifest discovery downloader persistence rat trojan

Malware Config

Extracted

Family

remcos

Botnet

Manifest

C2

linktreewealth.zapto.org:3980

linktreewealth.zapto.org:3981

linktreewealthy.zapto.org:3980

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-0B1XIG
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Extracted

Family

latentbot

C2

linktreewealth.zapto.org

linktreewealthy.zapto.org

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
LatentBot
Modular trojan written in Delphi which has been in-the-wild since 2013.
trojan latentbot
Latentbot family
latentbot
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Loads dropped DLL 1 IoCs

pid	Process
3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.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-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Snecks = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Feverish\\Halvdelene.bat"	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4560	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe
4560	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3436 set thread context of 4560	3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe	84

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	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4560	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3436 wrote to memory of 4560	3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe	84
PID 3436 wrote to memory of 4560	3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe	84
PID 3436 wrote to memory of 4560	3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe	84
PID 3436 wrote to memory of 4560	3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe	84
PID 3436 wrote to memory of 4560	3436	bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe	84

C:\Users\Admin\AppData\Local\Temp\bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe
"C:\Users\Admin\AppData\Local\Temp\bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.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:3436
- C:\Users\Admin\AppData\Local\Temp\bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.exe
  "C:\Users\Admin\AppData\Local\Temp\bfe72721ad2c670966f0d1a30af60b5d697731c31afdd028ee316d32ab2e4e17.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:4560

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

Exfiltration

Impact

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
74043114a389d1d56ee7e740f6f87988

SHA1
827d4e1ce0e3a0715959dc74b5441bc9a763570f

SHA256
bedfa677b80add6f353df1000758b566ce05b7becdf183028a3c5646616b477f

SHA512
868c3fa472f507e71d5f7580fdd8f3c507435eb7bcfca0298dcfecab7e736e6d99428f3069a333e55d2a9146648177e6a7b2d22df44b86224220a265cc4504f5

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsc59CA.tmp\System.dll

Filesize
12KB

MD5
4add245d4ba34b04f213409bfe504c07

SHA1
ef756d6581d70e87d58cc4982e3f4d18e0ea5b09

SHA256
9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706

SHA512
1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d

Download Submit
memory/3436-12-0x00000000030D0000-0x00000000045FF000-memory.dmp

Filesize
21.2MB

Download
memory/3436-13-0x0000000077E11000-0x0000000077F31000-memory.dmp

Filesize
1.1MB

Download
memory/3436-14-0x00000000752B5000-0x00000000752B6000-memory.dmp

Filesize
4KB

Download
memory/3436-15-0x00000000030D0000-0x00000000045FF000-memory.dmp

Filesize
21.2MB

Download
memory/4560-17-0x0000000001660000-0x0000000002B8F000-memory.dmp

Filesize
21.2MB

Download
memory/4560-18-0x0000000077E98000-0x0000000077E99000-memory.dmp

Filesize
4KB

Download
memory/4560-19-0x0000000077E11000-0x0000000077F31000-memory.dmp

Filesize
1.1MB

Download
memory/4560-21-0x0000000001660000-0x0000000002B8F000-memory.dmp

Filesize
21.2MB

Download
memory/4560-26-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4560-30-0x0000000077E11000-0x0000000077F31000-memory.dmp

Filesize
1.1MB

Download
memory/4560-16-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads