guloader | 878dfaab76cf42d9b0ac13431a95a6fbebd6f800e9e8d0538248e540f81813f1

Analysis

max time kernel
139s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
21-09-2023 08:28

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General

Target

ILINV02655092023 AT20231749.exe
Size

890KB
MD5

be5a939ce15470cb418311a731a05977
SHA1

18792193d0d5291d0bc7cd91101b08a533fdbf97
SHA256

878dfaab76cf42d9b0ac13431a95a6fbebd6f800e9e8d0538248e540f81813f1
SHA512

e412e38812b20837f42e52cbb3d8459c00a5b31cfbe911310689cf4501675ef5def274c7da99c080f762f9882ef03757f73b33beee909ad4310cec713494598f
SSDEEP

24576:eq7JcjVuj6xJCvuxFrtm9SpdmlK399NDpKGN/VcUNe:V7uw6x0uztmov3WGNNNe

Score

10^/10

guloader remcos crypted downloader persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Crypted

ourt2949aslumes9.duckdns.org:2401

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
true
install_flag
false
keylog_crypt
false
keylog_file
paqlgkfs.dat
keylog_flag
false
keylog_path
%AppData%
mouse_option
false
mutex
ourvbpld-RBN2WW
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
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

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

Processes:

ILINV02655092023 AT20231749.exewab.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	ILINV02655092023 AT20231749.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	wab.exe

Loads dropped DLL 6 IoCs

Processes:

ILINV02655092023 AT20231749.exe

pid	process
364	ILINV02655092023 AT20231749.exe
364	ILINV02655092023 AT20231749.exe
364	ILINV02655092023 AT20231749.exe
364	ILINV02655092023 AT20231749.exe
364	ILINV02655092023 AT20231749.exe
364	ILINV02655092023 AT20231749.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

wab.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Startup key = "C:\\Users\\Admin\\AppData\\Local\\Temp\\subfolder1\\Hovedrigt.exe"	wab.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

Processes:

wab.exe

pid process

4624 wab.exe
4624 wab.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

ILINV02655092023 AT20231749.exewab.exe

pid process

364 ILINV02655092023 AT20231749.exe
4624 wab.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ILINV02655092023 AT20231749.exe

description pid process target process

PID 364 set thread context of 4624 364 ILINV02655092023 AT20231749.exe wab.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2056 4624 WerFault.exe wab.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

ILINV02655092023 AT20231749.exe

pid process

364 ILINV02655092023 AT20231749.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

wab.exe

pid process

4624 wab.exe

pid	process
4624	wab.exe
4624	wab.exe

description	pid	process	target process
PID 364 set thread context of 4624	364	ILINV02655092023 AT20231749.exe	wab.exe

pid	pid_target	process	target process
2056	4624	WerFault.exe	wab.exe

pid	process
4624	wab.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

ILINV02655092023 AT20231749.exe

description	pid	process	target process
PID 364 wrote to memory of 4624	364	ILINV02655092023 AT20231749.exe	wab.exe
PID 364 wrote to memory of 4624	364	ILINV02655092023 AT20231749.exe	wab.exe
PID 364 wrote to memory of 4624	364	ILINV02655092023 AT20231749.exe	wab.exe
PID 364 wrote to memory of 4624	364	ILINV02655092023 AT20231749.exe	wab.exe
PID 364 wrote to memory of 4624	364	ILINV02655092023 AT20231749.exe	wab.exe

C:\Users\Admin\AppData\Local\Temp\ILINV02655092023 AT20231749.exe
"C:\Users\Admin\AppData\Local\Temp\ILINV02655092023 AT20231749.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:364

C:\Program Files (x86)\windows mail\wab.exe
"C:\Users\Admin\AppData\Local\Temp\ILINV02655092023 AT20231749.exe"
2⤵
- Checks QEMU agent file
- Adds Run key to start application
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetWindowsHookEx
PID:4624

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4624 -s 1368
3⤵
- Program crash
PID:2056

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4624 -ip 4624
1⤵
PID:1540

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

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\BgImage.dll
Filesize
7KB

MD5
487368e6fce9ab9c5ea053af0990c5ef

SHA1
b538e37c87d4b9a7645dcbbd9e93025a31849702

SHA256
e27efa5dfde875bd6b826fafb4c7698db6b6e30e68715a1c03eb018e3170fc04

SHA512
bb3ed4c0d17a11365b72653112b48c8c63ab10590dda3dfd90aa453f0d64203000e4571c73998063352240e1671d14da5ee394439899aaa31054fa2e9b722ea7

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\BgImage.dll
Filesize
7KB

MD5
487368e6fce9ab9c5ea053af0990c5ef

SHA1
b538e37c87d4b9a7645dcbbd9e93025a31849702

SHA256
e27efa5dfde875bd6b826fafb4c7698db6b6e30e68715a1c03eb018e3170fc04

SHA512
bb3ed4c0d17a11365b72653112b48c8c63ab10590dda3dfd90aa453f0d64203000e4571c73998063352240e1671d14da5ee394439899aaa31054fa2e9b722ea7

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\BgImage.dll
Filesize
7KB

MD5
487368e6fce9ab9c5ea053af0990c5ef

SHA1
b538e37c87d4b9a7645dcbbd9e93025a31849702

SHA256
e27efa5dfde875bd6b826fafb4c7698db6b6e30e68715a1c03eb018e3170fc04

SHA512
bb3ed4c0d17a11365b72653112b48c8c63ab10590dda3dfd90aa453f0d64203000e4571c73998063352240e1671d14da5ee394439899aaa31054fa2e9b722ea7

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\System.dll
Filesize
12KB

MD5
0d7ad4f45dc6f5aa87f606d0331c6901

SHA1
48df0911f0484cbe2a8cdd5362140b63c41ee457

SHA256
3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca

SHA512
c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\System.dll
Filesize
12KB

MD5
0d7ad4f45dc6f5aa87f606d0331c6901

SHA1
48df0911f0484cbe2a8cdd5362140b63c41ee457

SHA256
3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca

SHA512
c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\System.dll
Filesize
12KB

MD5
0d7ad4f45dc6f5aa87f606d0331c6901

SHA1
48df0911f0484cbe2a8cdd5362140b63c41ee457

SHA256
3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca

SHA512
c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\nsDialogs.dll
Filesize
9KB

MD5
466179e1c8ee8a1ff5e4427dbb6c4a01

SHA1
eb607467009074278e4bd50c7eab400e95ae48f7

SHA256
1e40211af65923c2f4fd02ce021458a7745d28e2f383835e3015e96575632172

SHA512
7508a29c722d45297bfb090c8eb49bd1560ef7d4b35413f16a8aed62d3b1030a93d001a09de98c2b9fea9acf062dc99a7278786f4ece222e7436b261d14ca817

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\nsDialogs.dll
Filesize
9KB

MD5
466179e1c8ee8a1ff5e4427dbb6c4a01

SHA1
eb607467009074278e4bd50c7eab400e95ae48f7

SHA256
1e40211af65923c2f4fd02ce021458a7745d28e2f383835e3015e96575632172

SHA512
7508a29c722d45297bfb090c8eb49bd1560ef7d4b35413f16a8aed62d3b1030a93d001a09de98c2b9fea9acf062dc99a7278786f4ece222e7436b261d14ca817

Download Submit
C:\Users\Admin\AppData\Local\Temp\nslC804.tmp\nsDialogs.dll
Filesize
9KB

MD5
466179e1c8ee8a1ff5e4427dbb6c4a01

SHA1
eb607467009074278e4bd50c7eab400e95ae48f7

SHA256
1e40211af65923c2f4fd02ce021458a7745d28e2f383835e3015e96575632172

SHA512
7508a29c722d45297bfb090c8eb49bd1560ef7d4b35413f16a8aed62d3b1030a93d001a09de98c2b9fea9acf062dc99a7278786f4ece222e7436b261d14ca817

Download Submit
memory/364-26-0x0000000004A20000-0x0000000006E8F000-memory.dmp

Filesize
36.4MB

Download
memory/364-27-0x0000000004A20000-0x0000000006E8F000-memory.dmp

Filesize
36.4MB

Download
memory/364-28-0x0000000077781000-0x00000000778A1000-memory.dmp

Filesize
1.1MB

Download
memory/364-29-0x00000000745E0000-0x00000000745E7000-memory.dmp

Filesize
28KB

Download
memory/4624-30-0x0000000000AF0000-0x0000000002F5F000-memory.dmp

Filesize
36.4MB

Download
memory/4624-31-0x0000000000AF0000-0x0000000002F5F000-memory.dmp

Filesize
36.4MB

Download
memory/4624-32-0x0000000077808000-0x0000000077809000-memory.dmp

Filesize
4KB

Download
memory/4624-33-0x0000000077781000-0x00000000778A1000-memory.dmp

Filesize
1.1MB

Download
memory/4624-35-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-36-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-37-0x0000000000AF0000-0x0000000002F5F000-memory.dmp

Filesize
36.4MB

Download
memory/4624-39-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-38-0x0000000000AF0000-0x0000000002F5F000-memory.dmp

Filesize
36.4MB

Download
memory/4624-40-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-41-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-42-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-43-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-44-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-45-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-46-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-47-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-48-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-49-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-50-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-51-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-54-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-55-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-56-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-57-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-58-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-59-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-60-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-61-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-62-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-64-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-65-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-66-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-67-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-68-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-69-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-70-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-71-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-72-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-73-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-74-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-75-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-76-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-77-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-78-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-79-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-80-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-81-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-82-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-83-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-84-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-85-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-87-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-88-0x00000000730E0000-0x0000000074334000-memory.dmp

Filesize
18.3MB

Download
memory/4624-94-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-93-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-95-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-96-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-97-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-98-0x0000000000AF0000-0x0000000002F5F000-memory.dmp

Filesize
36.4MB

Download
memory/4624-99-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-100-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-101-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download
memory/4624-102-0x00000000730E0000-0x0000000073162000-memory.dmp

Filesize
520KB

Download