guloader | 950a5130cc8ca680304c24e5294b9b5303883ce46a2894f23f01ddb39da7fb71

General

Target

Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.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
3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.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-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Snecks = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Feverish\\Halvdelene.bat"	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2744	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
2744	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3124 set thread context of 2744	3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	82

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	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2744	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2744	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3124 wrote to memory of 2744	3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	82
PID 3124 wrote to memory of 2744	3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	82
PID 3124 wrote to memory of 2744	3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	82
PID 3124 wrote to memory of 2744	3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	82
PID 3124 wrote to memory of 2744	3124	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	82

C:\Users\Admin\AppData\Local\Temp\Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
"C:\Users\Admin\AppData\Local\Temp\Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3124
- C:\Users\Admin\AppData\Local\Temp\Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
  "C:\Users\Admin\AppData\Local\Temp\Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of SetWindowsHookEx
  PID:2744

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

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
66dc017acf1a88ce39a641b4a951dca2

SHA1
c0f04c37b0b5e93990f791314b5c140afce3bbfe

SHA256
f6ca506e884d324c5cb074f1bf64360d83c4c91eb2d5f60e442f8586ed432c02

SHA512
a6fc7911c6783c6b5852f9f8bcb4a30c6346963ea9d3109578cd132193a307beb9876e0070ffe0721a586c2f86157c86747deb4140d20bb077587b765a1239de

Download Submit
C:\Users\Admin\AppData\Local\Temp\nssB43E.tmp\System.dll

Filesize
12KB

MD5
4add245d4ba34b04f213409bfe504c07

SHA1
ef756d6581d70e87d58cc4982e3f4d18e0ea5b09

SHA256
9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706

SHA512
1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d

Download Submit
memory/2744-21-0x0000000001660000-0x0000000002B8F000-memory.dmp

Filesize
21.2MB

Download
memory/2744-15-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2744-17-0x0000000001660000-0x0000000002B8F000-memory.dmp

Filesize
21.2MB

Download
memory/2744-18-0x00000000778A8000-0x00000000778A9000-memory.dmp

Filesize
4KB

Download
memory/2744-19-0x0000000077821000-0x0000000077941000-memory.dmp

Filesize
1.1MB

Download
memory/2744-25-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2744-26-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2744-30-0x0000000077821000-0x0000000077941000-memory.dmp

Filesize
1.1MB

Download
memory/3124-14-0x0000000074CC5000-0x0000000074CC6000-memory.dmp

Filesize
4KB

Download
memory/3124-16-0x0000000003140000-0x000000000466F000-memory.dmp

Filesize
21.2MB

Download
memory/3124-13-0x0000000077821000-0x0000000077941000-memory.dmp

Filesize
1.1MB

Download
memory/3124-12-0x0000000003140000-0x000000000466F000-memory.dmp

Filesize
21.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads