guloader | 2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68

General

Target

2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
Size

519KB
MD5

cfd30b0bf833178f0d730ae3703b4c56
SHA1

de278f275878b570ce2a5efb69456555e888eaae
SHA256

2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68
SHA512

109deb972cf14b889687ffd58587a603fd9bd4b2a744bc4fb033552e8148a7232e8021db973432335a9ea1dcc2518effee11eb57ad85c3b34d2239fcc50461b9
SSDEEP

6144:sp8oOpVQtWBonIuwtkzixAn9EF99+wykDaxfnasuDjvdjplyTztn1xT4p+/l/JbX:po+VIWBonIuwQn9EF99+SDRfnqBr+KsW

Score

10^/10

guloader remcos remotehost collection credential_access discovery downloader rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

162.251.122.106:2404

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-A7EXAF
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
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Detected Nirsoft tools 8 IoCs

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

resource	yara_rule
behavioral1/memory/1868-34-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/1272-35-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/1972-28-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/1972-26-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/1272-33-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/1272-38-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/1972-43-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/1868-47-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1868-34-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral1/memory/1868-47-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/1972-28-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/1972-26-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/1972-43-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 1 IoCs

pid	Process
2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.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-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2624 set thread context of 2728	2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	30
PID 2728 set thread context of 1972	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	32
PID 2728 set thread context of 1868	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	33
PID 2728 set thread context of 1272	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	34

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	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1972	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
1972	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1272	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2624 wrote to memory of 2728	2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	30
PID 2624 wrote to memory of 2728	2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	30
PID 2624 wrote to memory of 2728	2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	30
PID 2624 wrote to memory of 2728	2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	30
PID 2624 wrote to memory of 2728	2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	30
PID 2624 wrote to memory of 2728	2624	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	30
PID 2728 wrote to memory of 1972	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	32
PID 2728 wrote to memory of 1972	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	32
PID 2728 wrote to memory of 1972	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	32
PID 2728 wrote to memory of 1972	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	32
PID 2728 wrote to memory of 1868	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	33
PID 2728 wrote to memory of 1868	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	33
PID 2728 wrote to memory of 1868	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	33
PID 2728 wrote to memory of 1868	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	33
PID 2728 wrote to memory of 1272	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	34
PID 2728 wrote to memory of 1272	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	34
PID 2728 wrote to memory of 1272	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	34
PID 2728 wrote to memory of 1272	2728	2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe	34

C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
"C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.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:2624
- C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
  "C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe"
  2⤵
  - 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:2728
- - C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
    C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe /stext "C:\Users\Admin\AppData\Local\Temp\dkbyfoaxrolta"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:1972
- - C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
    C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe /stext "C:\Users\Admin\AppData\Local\Temp\negrgglynwdykatt"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:1868
- - C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe
    C:\Users\Admin\AppData\Local\Temp\2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68.exe /stext "C:\Users\Admin\AppData\Local\Temp\pgmbgzvsaevcngixdmzp"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
9a9cb49d4675a47be4288aa9791ebd96

SHA1
6e34cb597660c126447c96304ec2969fa5244d35

SHA256
040ec5fdde7c705f3ad17af90575820eaa9a023e8038beb0b01079cd5ab84d28

SHA512
2479bd3e21be8c6b7af4e65ae5dfcab0c0b34313bdf080bf895ef6164ed4c8058c863fe85da76d7a63f435c7d2d9db3ca8f8b1ea0ee5285805cdcc57b6424cd8

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

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
\Users\Admin\AppData\Local\Temp\nst6578.tmp\System.dll

Filesize
11KB

MD5
3f176d1ee13b0d7d6bd92e1c7a0b9bae

SHA1
fe582246792774c2c9dd15639ffa0aca90d6fd0b

SHA256
fa4ab1d6f79fd677433a31ada7806373a789d34328da46ccb0449bbf347bd73e

SHA512
0a69124819b7568d0dea4e9e85ce8fe61c7ba697c934e3a95e2dcfb9f252b1d9da7faf8774b6e8efd614885507acc94987733eba09a2f5e7098b774dfc8524b6

Download Submit
memory/1272-35-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-38-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-31-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-32-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1272-33-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1868-47-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1868-30-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1868-27-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1868-34-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1972-25-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1972-28-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1972-26-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1972-24-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1972-43-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2624-14-0x0000000002D80000-0x00000000054AD000-memory.dmp

Filesize
39.2MB

Download
memory/2624-22-0x0000000002D80000-0x00000000054AD000-memory.dmp

Filesize
39.2MB

Download
memory/2624-12-0x0000000002D80000-0x00000000054AD000-memory.dmp

Filesize
39.2MB

Download
memory/2624-13-0x0000000076EC1000-0x0000000076FC2000-memory.dmp

Filesize
1.0MB

Download
memory/2624-15-0x0000000076EC0000-0x0000000077069000-memory.dmp

Filesize
1.7MB

Download
memory/2728-53-0x0000000033740000-0x0000000033759000-memory.dmp

Filesize
100KB

Download
memory/2728-19-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-49-0x0000000033740000-0x0000000033759000-memory.dmp

Filesize
100KB

Download
memory/2728-17-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-52-0x0000000033740000-0x0000000033759000-memory.dmp

Filesize
100KB

Download
memory/2728-54-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-57-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-16-0x0000000076EC0000-0x0000000077069000-memory.dmp

Filesize
1.7MB

Download
memory/2728-60-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-63-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-66-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-69-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-72-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-75-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-78-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2728-81-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download

Analysis

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