guloader | 343b2ad0290badf5ce4700a3b93866f63ef8157b157f09cb3c9da4f3efd1c1c2

Analysis

max time kernel
143s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
03/10/2023, 06:08

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General

Target

file.exe
Size

574KB
MD5

69bf840d279bb17e387e74914a122af6
SHA1

7c5e6a9c7107ed3ef251d5571ef2dd053165ec8d
SHA256

343b2ad0290badf5ce4700a3b93866f63ef8157b157f09cb3c9da4f3efd1c1c2
SHA512

6d374c7b929b3f52b1723e0a13e316a0d51e6fee43e949a3453b77b1d7a7e11018a5ae279996c004fa26f161115c331a96f0a1ef01725aa847ce292d18792d84
SSDEEP

12288:V0obxAhh3kCS/ylnAjQSLhBPlyF1+SULR2NpT5R:hlAoiFSnlyFk1LR8pT5R

Score

10^/10

guloader remcos sammmmm collection downloader persistence rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

Sammmmm

185.225.74.166:1606

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
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-46ILKG
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

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1788-250-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral2/memory/1788-255-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1844-248-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1844-263-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 6 IoCs

resource	yara_rule
behavioral2/memory/1844-248-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/1788-250-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/1788-255-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/4704-259-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4704-260-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1844-263-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	file.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	file.exe

Loads dropped DLL 2 IoCs

pid	Process
4880	file.exe
4880	file.exe

Reads user/profile data of web browsers 2 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

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2344688013-2965468717-2034126-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	file.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-1-5-21-2344688013-2965468717-2034126-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Ischialgia = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Foreteelserne211\\Bistaaedes244.exe"	file.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
3104	file.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4880	file.exe
3104	file.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4880 set thread context of 3104	4880	file.exe	99
PID 3104 set thread context of 1844	3104	file.exe	102
PID 3104 set thread context of 1788	3104	file.exe	103
PID 3104 set thread context of 4704	3104	file.exe	104

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\amelanchier\fagpolitisk.lid	file.exe
File opened for modification	C:\Windows\gedeskg\jeminas.chu	file.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1708	3104	WerFault.exe	99

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1844	file.exe
1844	file.exe
4704	file.exe
4704	file.exe
1844	file.exe
1844	file.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
4880	file.exe
3104	file.exe
3104	file.exe
3104	file.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4704	file.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3104	file.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3104	file.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4880 wrote to memory of 3104	4880	file.exe	99
PID 4880 wrote to memory of 3104	4880	file.exe	99
PID 4880 wrote to memory of 3104	4880	file.exe	99
PID 4880 wrote to memory of 3104	4880	file.exe	99
PID 4880 wrote to memory of 3104	4880	file.exe	99
PID 3104 wrote to memory of 1844	3104	file.exe	102
PID 3104 wrote to memory of 1844	3104	file.exe	102
PID 3104 wrote to memory of 1844	3104	file.exe	102
PID 3104 wrote to memory of 1788	3104	file.exe	103
PID 3104 wrote to memory of 1788	3104	file.exe	103
PID 3104 wrote to memory of 1788	3104	file.exe	103
PID 3104 wrote to memory of 4704	3104	file.exe	104
PID 3104 wrote to memory of 4704	3104	file.exe	104
PID 3104 wrote to memory of 4704	3104	file.exe	104

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4880
- C:\Users\Admin\AppData\Local\Temp\file.exe
  "C:\Users\Admin\AppData\Local\Temp\file.exe"
  2⤵
  - Checks QEMU agent file
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:3104
- - C:\Users\Admin\AppData\Local\Temp\file.exe
    C:\Users\Admin\AppData\Local\Temp\file.exe /stext "C:\Users\Admin\AppData\Local\Temp\ndvtkriylzb"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:1844
- - C:\Users\Admin\AppData\Local\Temp\file.exe
    C:\Users\Admin\AppData\Local\Temp\file.exe /stext "C:\Users\Admin\AppData\Local\Temp\xfimkcsazhtvafk"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1788
- - C:\Users\Admin\AppData\Local\Temp\file.exe
    C:\Users\Admin\AppData\Local\Temp\file.exe /stext "C:\Users\Admin\AppData\Local\Temp\aznwludtvqlaklgsvl"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4704
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3104 -s 1892
    3⤵
    - Program crash
    PID:1708

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 364 -p 3104 -ip 3104
1⤵
PID:1384

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

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ndvtkriylzb

Filesize
4KB

MD5
eb3c3b62670ddbade705bcd24e9aa579

SHA1
1b81d999e9a5746ff5d24505c26f717c4e4be8b7

SHA256
7f741423d89d34e74539783a8ffd1463bc67300bd8a4bdf4f95faaa53c9efa23

SHA512
4187e1796c875b39860c6df698f2317d3b0c9a1328a635aebe37576625f510f28e842cc30f06bb1847de3ceef53b7cdb0001290aec90a5fcada51d0f75bce3f1

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsu7783.tmp\System.dll

Filesize
11KB

MD5
34442e1e0c2870341df55e1b7b3cccdc

SHA1
99b2fa21aead4b6ccd8ff2f6d3d3453a51d9c70c

SHA256
269d232712c86983336badb40b9e55e80052d8389ed095ebf9214964d43b6bb1

SHA512
4a8c57fb12997438b488b862f3fc9dc0f236e07bb47b2bce6053dcb03ac7ad171842f02ac749f02dda4719c681d186330524cd2953d33cb50854844e74b33d51

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsu7783.tmp\System.dll

Filesize
11KB

MD5
34442e1e0c2870341df55e1b7b3cccdc

SHA1
99b2fa21aead4b6ccd8ff2f6d3d3453a51d9c70c

SHA256
269d232712c86983336badb40b9e55e80052d8389ed095ebf9214964d43b6bb1

SHA512
4a8c57fb12997438b488b862f3fc9dc0f236e07bb47b2bce6053dcb03ac7ad171842f02ac749f02dda4719c681d186330524cd2953d33cb50854844e74b33d51

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsu7783.tmp\System.dll

Filesize
11KB

MD5
34442e1e0c2870341df55e1b7b3cccdc

SHA1
99b2fa21aead4b6ccd8ff2f6d3d3453a51d9c70c

SHA256
269d232712c86983336badb40b9e55e80052d8389ed095ebf9214964d43b6bb1

SHA512
4a8c57fb12997438b488b862f3fc9dc0f236e07bb47b2bce6053dcb03ac7ad171842f02ac749f02dda4719c681d186330524cd2953d33cb50854844e74b33d51

Download Submit
C:\Users\Admin\antirachitically.ini

Filesize
37B

MD5
dc162b140294db15512791cd220783b0

SHA1
3aea809077577eea8a6615d32964dbbc2f74e783

SHA256
dee92e7829a8e3773852fab991cf08c61f9f47cd377aef602d778f2ab4b64af4

SHA512
b2fb8452db12a05ae6bbf7f50aa608cd219418f467c90f4d0023f5e666580bf613709ad50664c14a352412fc96ead8236850a338ca52e5327f09e9d704bf96f0

Download Submit
memory/1788-255-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1788-250-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1788-245-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1788-242-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1844-240-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1844-263-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1844-248-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1844-244-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3104-216-0x0000000000460000-0x0000000002483000-memory.dmp

Filesize
32.1MB

Download
memory/3104-266-0x0000000033630000-0x0000000033649000-memory.dmp

Filesize
100KB

Download
memory/3104-237-0x0000000000460000-0x0000000002483000-memory.dmp

Filesize
32.1MB

Download
memory/3104-233-0x00000000726F0000-0x0000000073944000-memory.dmp

Filesize
18.3MB

Download
memory/3104-219-0x0000000076FA1000-0x00000000770C1000-memory.dmp

Filesize
1.1MB

Download
memory/3104-218-0x0000000077028000-0x0000000077029000-memory.dmp

Filesize
4KB

Download
memory/3104-217-0x0000000000460000-0x0000000002483000-memory.dmp

Filesize
32.1MB

Download
memory/3104-272-0x0000000033630000-0x0000000033649000-memory.dmp

Filesize
100KB

Download
memory/3104-271-0x00000000726F0000-0x0000000073944000-memory.dmp

Filesize
18.3MB

Download
memory/3104-238-0x00000000726F0000-0x0000000073944000-memory.dmp

Filesize
18.3MB

Download
memory/3104-270-0x0000000000460000-0x0000000002483000-memory.dmp

Filesize
32.1MB

Download
memory/3104-269-0x0000000033630000-0x0000000033649000-memory.dmp

Filesize
100KB

Download
memory/4704-247-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4704-260-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4704-259-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4704-256-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4880-213-0x0000000004320000-0x0000000006343000-memory.dmp

Filesize
32.1MB

Download
memory/4880-212-0x0000000004320000-0x0000000006343000-memory.dmp

Filesize
32.1MB

Download
memory/4880-214-0x0000000076FA1000-0x00000000770C1000-memory.dmp

Filesize
1.1MB

Download
memory/4880-215-0x0000000073BF0000-0x0000000073BF6000-memory.dmp

Filesize
24KB

Download