guloader | 0dd1595e59366de724e13ddb1df995698e62cc62a3b975eee3b0943352d2c1fc

General

Target

2a138508a3f7ad82efdeaaf2fc2e44b8.exe
Size

316KB
MD5

2a138508a3f7ad82efdeaaf2fc2e44b8
SHA1

af000f491f22fb1903f7ade1dad025ced9fa6a54
SHA256

0dd1595e59366de724e13ddb1df995698e62cc62a3b975eee3b0943352d2c1fc
SHA512

616a2aed06756f3ecee8c8ce86f2209d566d73806400ba2842a90204505c2b4bb9f3e56f6d6b23ad45bdd4e62014d43506383c6465a22dd53c41b74afe162c43
SSDEEP

6144:h3hqL36MLuSGP5cBl32nKaGstWs8soSoGhMfA07X52iWKmLrCBZ0O:h3l1ofaGxuoaR0LAdJWj0O

Score

10^/10

guloader remcos remotehost collection downloader rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

209.127.186.232:4765

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-YRLOX5
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 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1616-73-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral1/memory/1616-77-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral1/memory/1616-93-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/1900-69-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/1900-84-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 7 IoCs

resource	yara_rule
behavioral1/memory/1616-73-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral1/memory/1900-69-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/1616-77-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral1/memory/1992-78-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/1992-75-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/1900-84-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/1616-93-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft

Loads dropped DLL 5 IoCs

pid	Process
2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2108	2a138508a3f7ad82efdeaaf2fc2e44b8.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-1-5-21-1154728922-3261336865-3456416385-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	2a138508a3f7ad82efdeaaf2fc2e44b8.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2108 set thread context of 2812	2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	28
PID 2812 set thread context of 1900	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	35
PID 2812 set thread context of 1616	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	34
PID 2812 set thread context of 1992	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	33

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\afklaringskursus\superannate.fly	2a138508a3f7ad82efdeaaf2fc2e44b8.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
1972	2812	WerFault.exe	28

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1900	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
1900	2a138508a3f7ad82efdeaaf2fc2e44b8.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe
2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1992	2a138508a3f7ad82efdeaaf2fc2e44b8.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2108 wrote to memory of 2812	2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	28
PID 2108 wrote to memory of 2812	2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	28
PID 2108 wrote to memory of 2812	2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	28
PID 2108 wrote to memory of 2812	2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	28
PID 2108 wrote to memory of 2812	2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	28
PID 2108 wrote to memory of 2812	2108	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	28
PID 2812 wrote to memory of 1900	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	35
PID 2812 wrote to memory of 1900	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	35
PID 2812 wrote to memory of 1900	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	35
PID 2812 wrote to memory of 1900	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	35
PID 2812 wrote to memory of 1616	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	34
PID 2812 wrote to memory of 1616	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	34
PID 2812 wrote to memory of 1616	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	34
PID 2812 wrote to memory of 1616	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	34
PID 2812 wrote to memory of 1992	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	33
PID 2812 wrote to memory of 1992	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	33
PID 2812 wrote to memory of 1992	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	33
PID 2812 wrote to memory of 1992	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	33
PID 2812 wrote to memory of 1972	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	36
PID 2812 wrote to memory of 1972	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	36
PID 2812 wrote to memory of 1972	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	36
PID 2812 wrote to memory of 1972	2812	2a138508a3f7ad82efdeaaf2fc2e44b8.exe	36

C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe
"C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2108
- C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe
  "C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2812
- - C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe
    C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe /stext "C:\Users\Admin\AppData\Local\Temp\bypdpmduvmnarx"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1992
- - C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe
    C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe /stext "C:\Users\Admin\AppData\Local\Temp\qeklotsbhev"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1616
- - C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe
    C:\Users\Admin\AppData\Local\Temp\2a138508a3f7ad82efdeaaf2fc2e44b8.exe /stext "C:\Users\Admin\AppData\Local\Temp\ocfsobhz"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:1900
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2812 -s 1452
    3⤵
    - Program crash
    PID:1972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nso4F1B.tmp\LangDLL.dll

Filesize
5KB

MD5
08de81a4584f5201086f57a7a93ed83b

SHA1
266a6ecc8fb7dca115e6915cd75e2595816841a8

SHA256
4883cd4231744be2dca4433ef62824b7957a3c16be54f8526270402d9413ebe6

SHA512
b72e7cea5ce1f4dc64e65a1f683a3ef9e3fa2dc45cf421f569eb461f1fdcc0caf4ff62a872e62b400579f567c6ff9fc3c2e6e020cdca89d96015502c803a09b9

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

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
\Users\Admin\AppData\Local\Temp\nso4F1B.tmp\LangDLL.dll

Filesize
5KB

MD5
08de81a4584f5201086f57a7a93ed83b

SHA1
266a6ecc8fb7dca115e6915cd75e2595816841a8

SHA256
4883cd4231744be2dca4433ef62824b7957a3c16be54f8526270402d9413ebe6

SHA512
b72e7cea5ce1f4dc64e65a1f683a3ef9e3fa2dc45cf421f569eb461f1fdcc0caf4ff62a872e62b400579f567c6ff9fc3c2e6e020cdca89d96015502c803a09b9

Download Submit
\Users\Admin\AppData\Local\Temp\nso4F1B.tmp\LangDLL.dll

Filesize
5KB

MD5
08de81a4584f5201086f57a7a93ed83b

SHA1
266a6ecc8fb7dca115e6915cd75e2595816841a8

SHA256
4883cd4231744be2dca4433ef62824b7957a3c16be54f8526270402d9413ebe6

SHA512
b72e7cea5ce1f4dc64e65a1f683a3ef9e3fa2dc45cf421f569eb461f1fdcc0caf4ff62a872e62b400579f567c6ff9fc3c2e6e020cdca89d96015502c803a09b9

Download Submit
\Users\Admin\AppData\Local\Temp\nso4F1B.tmp\LangDLL.dll

Filesize
5KB

MD5
08de81a4584f5201086f57a7a93ed83b

SHA1
266a6ecc8fb7dca115e6915cd75e2595816841a8

SHA256
4883cd4231744be2dca4433ef62824b7957a3c16be54f8526270402d9413ebe6

SHA512
b72e7cea5ce1f4dc64e65a1f683a3ef9e3fa2dc45cf421f569eb461f1fdcc0caf4ff62a872e62b400579f567c6ff9fc3c2e6e020cdca89d96015502c803a09b9

Download Submit
\Users\Admin\AppData\Local\Temp\nso4F1B.tmp\LangDLL.dll

Filesize
5KB

MD5
08de81a4584f5201086f57a7a93ed83b

SHA1
266a6ecc8fb7dca115e6915cd75e2595816841a8

SHA256
4883cd4231744be2dca4433ef62824b7957a3c16be54f8526270402d9413ebe6

SHA512
b72e7cea5ce1f4dc64e65a1f683a3ef9e3fa2dc45cf421f569eb461f1fdcc0caf4ff62a872e62b400579f567c6ff9fc3c2e6e020cdca89d96015502c803a09b9

Download Submit
\Users\Admin\AppData\Local\Temp\nso4F1B.tmp\System.dll

Filesize
12KB

MD5
6e55a6e7c3fdbd244042eb15cb1ec739

SHA1
070ea80e2192abc42f358d47b276990b5fa285a9

SHA256
acf90ab6f4edc687e94aaf604d05e16e6cfb5e35873783b50c66f307a35c6506

SHA512
2d504b74da38edc967e3859733a2a9cacd885db82f0ca69bfb66872e882707314c54238344d45945dc98bae85772aceef71a741787922d640627d3c8ae8f1c35

Download Submit
memory/1616-93-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1616-77-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1616-73-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1616-71-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1616-63-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1900-62-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1900-84-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1900-69-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1900-66-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1992-74-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1992-75-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1992-70-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1992-78-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2108-29-0x00000000033B0000-0x000000000578B000-memory.dmp

Filesize
35.9MB

Download
memory/2108-31-0x00000000742C0000-0x00000000742C7000-memory.dmp

Filesize
28KB

Download
memory/2108-27-0x00000000033B0000-0x000000000578B000-memory.dmp

Filesize
35.9MB

Download
memory/2108-28-0x0000000076DA0000-0x0000000076F49000-memory.dmp

Filesize
1.7MB

Download
memory/2108-30-0x0000000076F90000-0x0000000077066000-memory.dmp

Filesize
856KB

Download
memory/2812-32-0x00000000007E0000-0x0000000002BBB000-memory.dmp

Filesize
35.9MB

Download
memory/2812-76-0x00000000007E0000-0x0000000002BBB000-memory.dmp

Filesize
35.9MB

Download
memory/2812-33-0x0000000076DA0000-0x0000000076F49000-memory.dmp

Filesize
1.7MB

Download
memory/2812-55-0x0000000072390000-0x00000000733F2000-memory.dmp

Filesize
16.4MB

Download
memory/2812-56-0x0000000072390000-0x00000000733F2000-memory.dmp

Filesize
16.4MB

Download
memory/2812-88-0x0000000032700000-0x0000000032719000-memory.dmp

Filesize
100KB

Download
memory/2812-92-0x0000000032700000-0x0000000032719000-memory.dmp

Filesize
100KB

Download
memory/2812-91-0x0000000076DA0000-0x0000000076F49000-memory.dmp

Filesize
1.7MB

Download
memory/2812-60-0x00000000007E0000-0x0000000002BBB000-memory.dmp

Filesize
35.9MB

Download
memory/2812-95-0x0000000072390000-0x00000000733F2000-memory.dmp

Filesize
16.4MB

Download

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