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
1240	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-1-5-21-1163522206-1469769407-485553996-1000\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
780	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
780	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1240 set thread context of 780	1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	31

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
1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
780	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
780	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1240 wrote to memory of 780	1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	31
PID 1240 wrote to memory of 780	1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	31
PID 1240 wrote to memory of 780	1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	31
PID 1240 wrote to memory of 780	1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	31
PID 1240 wrote to memory of 780	1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	31
PID 1240 wrote to memory of 780	1240	Awb_Shipping_confirmation_doc_010720257820020031808174CN18003010142025.exe	31

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:1240
- 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
  - Modifies system certificate store
  - Suspicious use of SetWindowsHookEx
  PID:780

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

2

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

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

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
4f3f07e756ad8463c3faf5c89214e758

SHA1
003cdcdc7ebcaa0f44e2f464b413afe6aacbc0f5

SHA256
38bf58a2b06a79a69e904d408e921f7439adf8709c643f9df3cd2bc6731fbe6d

SHA512
54fc744ea225e9166fadb81213c3bfb09ae6d6da23295f3f02b0a19f1737cd6163a9ed365474c40f2af5dd55c0a9e1ccf1ee943d30f13107ab7241cb9111fcec

Download Submit
C:\Users\Admin\AppData\Local\Temp\Cab22BF.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar22F1.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
\Users\Admin\AppData\Local\Temp\nstBB17.tmp\System.dll

Filesize
12KB

MD5
4add245d4ba34b04f213409bfe504c07

SHA1
ef756d6581d70e87d58cc4982e3f4d18e0ea5b09

SHA256
9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706

SHA512
1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d

Download Submit
memory/780-17-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/780-18-0x0000000076F30000-0x00000000770D9000-memory.dmp

Filesize
1.7MB

Download
memory/780-20-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/780-74-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/1240-13-0x00000000037D0000-0x0000000004CFF000-memory.dmp

Filesize
21.2MB

Download
memory/1240-14-0x0000000076F31000-0x0000000077032000-memory.dmp

Filesize
1.0MB

Download
memory/1240-15-0x0000000076F30000-0x00000000770D9000-memory.dmp

Filesize
1.7MB

Download
memory/1240-16-0x00000000037D0000-0x0000000004CFF000-memory.dmp

Filesize
21.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads