guloader | 4c978f15572a2b4a8205658fbdad088683c97a15b3b2ebf6104f79d95f7d86a5

General

Target

Inquiry sheet.exe
Size

735KB
MD5

aefec84b0cf65067ab3252ffa4138be9
SHA1

8428b6535d5f0ffd40a11caa713a7b1b053b5fd4
SHA256

dfa4504070e1c32a693e9f6d89dc381e114efb66e450bb2ebcd4594fa06d1568
SHA512

01485b43db4f1dc13f94ae3969d1e0e38e16c0fdb94a76e7d3d8241a411f9cc0dd2f9c85f8f84b159d3b0849059e693e9a84a76b32cf58bbd5a323dd0fa63810
SSDEEP

12288:WnPdCpJPjzlM9caF8tZoP78pNNVyUX+9dc9a:qPdUJPFM9c5tZvpNmUuZ

Score

10^/10

guloader remcos remcohost discovery downloader execution rat

Malware Config

Extracted

Family

remcos

Botnet

RemcoHost

C2

91.92.255.64:2404

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-5MDDGY
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

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2840	powershell.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2544	wabmig.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2840	powershell.exe
2544	wabmig.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2840 set thread context of 2544	2840	powershell.exe	31

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 3 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wabmig.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Inquiry sheet.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2840	powershell.exe
2840	powershell.exe
2840	powershell.exe
2840	powershell.exe
2840	powershell.exe
2840	powershell.exe
2840	powershell.exe
2840	powershell.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2840	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2840	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2844 wrote to memory of 2840	2844	Inquiry sheet.exe	28
PID 2844 wrote to memory of 2840	2844	Inquiry sheet.exe	28
PID 2844 wrote to memory of 2840	2844	Inquiry sheet.exe	28
PID 2844 wrote to memory of 2840	2844	Inquiry sheet.exe	28
PID 2840 wrote to memory of 2544	2840	powershell.exe	31
PID 2840 wrote to memory of 2544	2840	powershell.exe	31
PID 2840 wrote to memory of 2544	2840	powershell.exe	31
PID 2840 wrote to memory of 2544	2840	powershell.exe	31
PID 2840 wrote to memory of 2544	2840	powershell.exe	31
PID 2840 wrote to memory of 2544	2840	powershell.exe	31

C:\Users\Admin\AppData\Local\Temp\Inquiry sheet.exe
"C:\Users\Admin\AppData\Local\Temp\Inquiry sheet.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2844
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -windowstyle hidden "$Ejendomsfllesskabets=Get-Content 'C:\Users\Admin\AppData\Local\Calvarias\Fitcher\Unquiet.Hal128';$Dictatorially=$Ejendomsfllesskabets.SubString(56305,3);.$Dictatorially($Ejendomsfllesskabets) "
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2840
- - C:\Program Files (x86)\windows mail\wabmig.exe
    "C:\Program Files (x86)\windows mail\wabmig.exe"
    3⤵
    - Suspicious use of NtCreateThreadExHideFromDebugger
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - System Location Discovery: System Language Discovery
    PID:2544

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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:\Users\Admin\AppData\Local\Calvarias\Fitcher\Iscenesttere104.Gen

Filesize
309KB

MD5
46d1a28bea1c1554e0c438c108535e52

SHA1
2af80cb5c8ad0e41747622e8aa488f1efa8df1c2

SHA256
cd4f64e9aa391fa018ba036f9b3c342d531edcdd35afb5cd99f7ab2d7756d107

SHA512
c032f5fddadbcb780b2210696970495303f3339b45a3800181cee2bf898590fbe09463bc7a1b22a021f19d282a95d2825c322dbb7429a96c2e58d34dd8f2cf5c

Download Submit
C:\Users\Admin\AppData\Local\Calvarias\Fitcher\Unquiet.Hal128

Filesize
54KB

MD5
9a8fdf6c83c9dcbe02443ba384f1b0c4

SHA1
ce9c361af6f76016e05fdae18145cad0106e9305

SHA256
a1b131759b1b13bcfdb8b13a3d8e3b35e992c3f23e6be78cd00b0f9703747c7c

SHA512
c174bf5f949d0d4ca140b1a411bfbecdb0429947ae4280f105fe49bb11bdd461c92830a84dde4a67fa6331d2a7b0a14ccba5f32e2b10efd76c78c91e9b42f6f2

Download Submit
memory/2544-31-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-33-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-21-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-37-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-23-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-35-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-34-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-30-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-32-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-20-0x00000000012D0000-0x000000000552C000-memory.dmp

Filesize
66.4MB

Download
memory/2544-38-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-36-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-29-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-28-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2544-27-0x0000000000260000-0x00000000012C2000-memory.dmp

Filesize
16.4MB

Download
memory/2840-17-0x0000000073F00000-0x00000000744AB000-memory.dmp

Filesize
5.7MB

Download
memory/2840-8-0x0000000073F01000-0x0000000073F02000-memory.dmp

Filesize
4KB

Download
memory/2840-19-0x0000000073F00000-0x00000000744AB000-memory.dmp

Filesize
5.7MB

Download
memory/2840-18-0x0000000006600000-0x000000000A85C000-memory.dmp

Filesize
66.4MB

Download
memory/2840-11-0x0000000073F00000-0x00000000744AB000-memory.dmp

Filesize
5.7MB

Download
memory/2840-10-0x0000000073F00000-0x00000000744AB000-memory.dmp

Filesize
5.7MB

Download
memory/2840-15-0x0000000073F00000-0x00000000744AB000-memory.dmp

Filesize
5.7MB

Download
memory/2840-12-0x0000000073F00000-0x00000000744AB000-memory.dmp

Filesize
5.7MB

Download
memory/2840-9-0x0000000073F00000-0x00000000744AB000-memory.dmp

Filesize
5.7MB

Download

Analysis

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