guloader | a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d

Analysis

max time kernel
150s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
18-02-2025 03:24

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General

Target

a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
Size

732KB
MD5

003a9a042df090f1501ac0c0c4fc0285
SHA1

0209a7f124455a7d5ea4c128b774a3fc3212917d
SHA256

a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d
SHA512

ba9a498692712ff48299da767aea61611bb72cddc372e35cbc309b9b7ffc0a5ce9eb451058c2a9ab610c5d2b74f879c025807734e2a873959212329dfa5fa4af
SSDEEP

12288:fJIbMYmuXv4CgC5Lbdje79l3/LBynrcPmMe9mukxD:fJYmuXv4hILZul3/Fkcbe9md

Score

10^/10

guloader remcos remotehost collection discovery downloader persistence rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

216.250.252.33:60309

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-TJ7QLN
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 family
guloader
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
Remcos family
remcos

Detected Nirsoft tools 9 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/4024-65-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1244-61-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1244-60-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/4024-59-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1244-57-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1552-58-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4024-54-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1552-53-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/1552-69-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1244-61-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/1244-60-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/1244-57-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1552-58-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1552-53-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1552-69-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 1 IoCs

pid	Process
1588	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1161330783-2912525651-1278508834-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.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-1-5-21-1161330783-2912525651-1278508834-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Bremsebakke92 = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Acronomy\\Asymmetron.exe"	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1588	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3020 set thread context of 1552	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	90
PID 3020 set thread context of 1244	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	91
PID 3020 set thread context of 4024	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	92

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Redwing.ini	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\unstates.Kap233	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

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 5 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	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral2/files/0x0005000000022b2f-24.dat	nsis_installer_1
behavioral2/files/0x0005000000022b2f-24.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1552	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
1552	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
4024	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
4024	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
1552	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
1552	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
1588	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4024	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1588 wrote to memory of 3020	1588	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	87
PID 1588 wrote to memory of 3020	1588	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	87
PID 1588 wrote to memory of 3020	1588	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	87
PID 1588 wrote to memory of 3020	1588	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	87
PID 3020 wrote to memory of 1552	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	90
PID 3020 wrote to memory of 1552	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	90
PID 3020 wrote to memory of 1552	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	90
PID 3020 wrote to memory of 1244	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	91
PID 3020 wrote to memory of 1244	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	91
PID 3020 wrote to memory of 1244	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	91
PID 3020 wrote to memory of 4024	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	92
PID 3020 wrote to memory of 4024	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	92
PID 3020 wrote to memory of 4024	3020	a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe	92

C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
"C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1588
- C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
  "C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3020
- - C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
    C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe /stext "C:\Users\Admin\AppData\Local\Temp\zqhvuqreydmqmjhcdw"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:1552
- - C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
    C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe /stext "C:\Users\Admin\AppData\Local\Temp\ckmnvicfulecxqvgmhfos"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:1244
- - C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe
    C:\Users\Admin\AppData\Local\Temp\a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d.exe /stext "C:\Users\Admin\AppData\Local\Temp\mmaywbnzhtwhzwrsdssqvaxm"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
7896e9ccc85d0d71d8cdec6071d17640

SHA1
90e9c7b1ea7f160482f0caf358b927d6d8598b5e

SHA256
67ab6b9e3fad606f89a578fa9753a82598dd3106f573aae860051e625fe9bb43

SHA512
2efa8d2b6eec39232eb53adfae43495c3113f39a8514f4b0c02a3bbf31064fc2b02e37f3a6237a24014992cfd6076d11261e489e0c982cd0f30c046f61bde893

Download Submit
C:\Users\Admin\AppData\Local\Temp\Acronomy\Asymmetron.exe

Filesize
732KB

MD5
003a9a042df090f1501ac0c0c4fc0285

SHA1
0209a7f124455a7d5ea4c128b774a3fc3212917d

SHA256
a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d

SHA512
ba9a498692712ff48299da767aea61611bb72cddc372e35cbc309b9b7ffc0a5ce9eb451058c2a9ab610c5d2b74f879c025807734e2a873959212329dfa5fa4af

Download Submit
C:\Users\Admin\AppData\Local\Temp\nshBF7A.tmp\System.dll

Filesize
11KB

MD5
a436db0c473a087eb61ff5c53c34ba27

SHA1
65ea67e424e75f5065132b539c8b2eda88aa0506

SHA256
75ed40311875312617d6711baed0be29fcaee71031ca27a8d308a72b15a51e49

SHA512
908f46a855480af6eacb2fb64de0e60b1e04bbb10b23992e2cf38a4cbebdcd7d3928c4c022d7ad9f7479265a8f426b93eef580afec95570e654c360d62f5e08d

Download Submit
C:\Users\Admin\AppData\Local\Temp\zqhvuqreydmqmjhcdw

Filesize
4KB

MD5
f22611128e5004a90c9b9bf8b5288f02

SHA1
3278985396753f540bd38166c4f51f8ea27a584a

SHA256
50da64e96567bbf7ef6e2fadc47a503884a0ec63d4dd5456b85c68364ca3247c

SHA512
275d8a1b7b9ff5a25087abc8f87d06646fefd8d794b52841ae0125cb98645a52f2dd5f01d2b8fccba801a90acb7e46661b15568356c8875d37ea659920e52297

Download Submit
memory/1244-57-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1244-56-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1244-60-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1244-49-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1244-61-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1552-69-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1552-58-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1552-53-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1552-46-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1552-50-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1588-20-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/1588-19-0x0000000077A31000-0x0000000077B51000-memory.dmp

Filesize
1.1MB

Download
memory/1588-18-0x0000000077A31000-0x0000000077B51000-memory.dmp

Filesize
1.1MB

Download
memory/3020-75-0x0000000036270000-0x0000000036289000-memory.dmp

Filesize
100KB

Download
memory/3020-21-0x00000000016D0000-0x0000000004B20000-memory.dmp

Filesize
52.3MB

Download
memory/3020-111-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-99-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-43-0x00000000016D0000-0x0000000004B20000-memory.dmp

Filesize
52.3MB

Download
memory/3020-39-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-96-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-44-0x0000000077A31000-0x0000000077B51000-memory.dmp

Filesize
1.1MB

Download
memory/3020-93-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-29-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-23-0x0000000077A31000-0x0000000077B51000-memory.dmp

Filesize
1.1MB

Download
memory/3020-72-0x0000000036270000-0x0000000036289000-memory.dmp

Filesize
100KB

Download
memory/3020-76-0x0000000036270000-0x0000000036289000-memory.dmp

Filesize
100KB

Download
memory/3020-22-0x0000000077AB8000-0x0000000077AB9000-memory.dmp

Filesize
4KB

Download
memory/3020-78-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-81-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-90-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-84-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3020-87-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/4024-65-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4024-51-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4024-54-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4024-59-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4024-52-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download