guloader | 465c444d20b3e265e924360ced45ea8e6e8ef2cdf46ed4d7ae71ed9e1e4e10ca

General

Target

1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
Size

519KB
MD5

aaf009498fd654fe098a30d1ec1d3120
SHA1

d6de6ea6d8deb0b700cda51e8f366d3a333ffa29
SHA256

1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d
SHA512

6c601a13522500196ac58dc3b75ead4b438ddc149a4e1513a0657ea69be98845428f0bd76285218053532bfb59f702e091310dc92e00d9af1a7def2416581460
SSDEEP

6144:+xwgiJ4h+W4PQgPniiWn14owKYHvYLPG7nIsJmwu1WGFKPVMmNK1ftxU3WaN5rfx:cS4QZyn14rBHcgpJmwuAN7Cfn2v5P

Score

10^/10

guloader remcos benchao discovery downloader rat

Malware Config

Extracted

Family

remcos

Botnet

benchao

C2

tochisglobal.ddns.net:6426

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-9R4HLX
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

Loads dropped DLL 7 IoCs

pid	Process
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
520	wab.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
520	wab.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4376 set thread context of 520	4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe	95

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 2 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	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wab.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
520	wab.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4376 wrote to memory of 520	4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe	95
PID 4376 wrote to memory of 520	4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe	95
PID 4376 wrote to memory of 520	4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe	95
PID 4376 wrote to memory of 520	4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe	95
PID 4376 wrote to memory of 520	4376	1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe	95

C:\Users\Admin\AppData\Local\Temp\1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe
"C:\Users\Admin\AppData\Local\Temp\1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.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:4376
- C:\Program Files (x86)\windows mail\wab.exe
  "C:\Users\Admin\AppData\Local\Temp\1619172a202b25aff96beb80b21fbda70ed92237a88a7a4d990f5de77b19677d.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:520

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
68d72c1e5a42d4e2efe9765c233fa9db

SHA1
487003bf80daccb4a47e3d0598ba793ca2c7cdeb

SHA256
04166ca33f0990293d3d53e2e39078f8c201b72d939d48642a3becf33f2f3797

SHA512
c35eddae3b0a835d3b66cb757b6835c48c5fdb7b20f3a81b0384be0a3d8cbcfe0b5ac62cd55b2d6c0e551972e853f7ad0bfc0882db4518a6617fa8ddfb4fb3d4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsr641A.tmp\LangDLL.dll

Filesize
5KB

MD5
af4324802813a5a897db2167fc10e291

SHA1
916bd47457dcb4247743626e86492436b77bebf8

SHA256
92cb3b3a7280246743543325d3fe9a7d72c63227f9540d25d5ef27b2ce8856b4

SHA512
cb3e07c4558049634078808bd419860c6e2855a02bba79541cea80873fe6db58cf667a27c111521df09ef30f92c149736092c473fde28bbb5974be6d7ddab83c

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsr641A.tmp\System.dll

Filesize
12KB

MD5
6c38da8922cc37b4bbb77de4a63ad843

SHA1
4e0533fd11df8bddbd543ed58df7b6060d9f4631

SHA256
1624d9ad8b2e2658af224691263f64388ba3a997efe80011889e3c35237ce4c1

SHA512
ad0be3d7e57da9c304e9b9cac5341b6c76b157456ab44f5579d6c38c830a31c9c3e1e9a875b8f465243c607ea2ede6b0bb77237f17a70a4d4c78606e036c3430

Download Submit
C:\Users\Admin\strikkernes.lnk

Filesize
928B

MD5
09ed21bd518ae86a0b1a87c2b90e009e

SHA1
a54ebd3b3d02d143b11fa77eb735db1b84ff2d52

SHA256
b6c4287fa773a3de08ecfa0607ab67ab7299919156f0430adbcd40afaf24c76c

SHA512
bbffa224a77ccd1233b822ade2834bc7642dae4e0f761d89303e7955c688a34e1afc7766f2a061be7c59239133e828078b74f2b1b14d9eb09a493b8ec7380d90

Download Submit
memory/520-62-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-45-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-80-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-77-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-39-0x0000000002310000-0x0000000004BB5000-memory.dmp

Filesize
40.6MB

Download
memory/520-40-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-74-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-65-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-46-0x0000000002310000-0x0000000004BB5000-memory.dmp

Filesize
40.6MB

Download
memory/520-50-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-53-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-71-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-56-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-59-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/520-68-0x00000000010B0000-0x0000000002304000-memory.dmp

Filesize
18.3MB

Download
memory/4376-44-0x0000000004580000-0x0000000006E25000-memory.dmp

Filesize
40.6MB

Download
memory/4376-34-0x0000000004580000-0x0000000006E25000-memory.dmp

Filesize
40.6MB

Download
memory/4376-35-0x0000000004580000-0x0000000006E25000-memory.dmp

Filesize
40.6MB

Download
memory/4376-36-0x0000000077011000-0x0000000077131000-memory.dmp

Filesize
1.1MB

Download
memory/4376-38-0x0000000073E75000-0x0000000073E76000-memory.dmp

Filesize
4KB

Download
memory/4376-37-0x0000000077011000-0x0000000077131000-memory.dmp

Filesize
1.1MB

Download

Analysis

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