guloader | 5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41

General

Target

5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe
Size

384KB
MD5

5d44e0aa3a2b58c2877f513d80d01e19
SHA1

578fd865531470f640aed391a3b21993237c424b
SHA256

5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41
SHA512

37785964539860a328613c2d1b2454b7885fdc037a5ed95778afd66a822319a4fdf3d320142e75b1ee749a488a063f283d5a8683c54e56f0dd4c3b9356257d8b
SSDEEP

6144:DDv9rF8ANTnYjY+98jtTG1bSqOMYZHEeK20CSdLMDoCiSYDBSmE5WhDTXHwQ0w:/p7FkcsSqOREveA4ECKBSRydf

Score

10^/10

guloader remcos protected downloader execution persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Protected

C2

jgbours284hawara02.duckdns.org:3050

jgbours284hawara02.duckdns.org:3051

jgbours284hawara03.duckdns.org:3050

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
jiourhjs.dat
keylog_flag
false
keylog_path
%AppData%
mouse_option
false
mutex
klpcourg-793VPF
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

Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2520-52-0x0000000000490000-0x00000000014F2000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

2268 powershell.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3627615824-4061627003-3019543961-1000\Software\Microsoft\Windows\CurrentVersion\Run\Bladselleriens168 = "%Dicyandiamide% -windowstyle minimized $Anillas=(Get-ItemProperty -Path 'HKCU:\\Sufflr50\\').Fanegas;%Dicyandiamide% ($Anillas)"	reg.exe

Drops file in System32 directory 1 IoCs

Processes:

5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\Cantraip\brkjerns.she	5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

Processes:

wab.exe

pid process

2520 wab.exe
2520 wab.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

powershell.exewab.exe

pid process

2268 powershell.exe
2520 wab.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 2268 set thread context of 2520 2268 powershell.exe wab.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Modifies registry key 1 TTPs 1 IoCs

Modify Registry
T1112

Processes:

reg.exe

pid process

2464 reg.exe

pid	process
2520	wab.exe
2520	wab.exe

description	pid	process	target process
PID 2268 set thread context of 2520	2268	powershell.exe	wab.exe

pid	process
2464	reg.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

powershell.exe

pid	process
2268	powershell.exe
2268	powershell.exe
2268	powershell.exe
2268	powershell.exe
2268	powershell.exe
2268	powershell.exe
2268	powershell.exe
2268	powershell.exe

Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

powershell.exe

pid process

2268 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 2268 powershell.exe

description	pid	process
Token: SeDebugPrivilege	2268	powershell.exe

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exepowershell.exewab.execmd.exe

description	pid	process	target process
PID 3024 wrote to memory of 2268	3024	5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe	powershell.exe
PID 3024 wrote to memory of 2268	3024	5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe	powershell.exe
PID 3024 wrote to memory of 2268	3024	5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe	powershell.exe
PID 3024 wrote to memory of 2268	3024	5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe	powershell.exe
PID 2268 wrote to memory of 2588	2268	powershell.exe	cmd.exe
PID 2268 wrote to memory of 2588	2268	powershell.exe	cmd.exe
PID 2268 wrote to memory of 2588	2268	powershell.exe	cmd.exe
PID 2268 wrote to memory of 2588	2268	powershell.exe	cmd.exe
PID 2268 wrote to memory of 2520	2268	powershell.exe	wab.exe
PID 2268 wrote to memory of 2520	2268	powershell.exe	wab.exe
PID 2268 wrote to memory of 2520	2268	powershell.exe	wab.exe
PID 2268 wrote to memory of 2520	2268	powershell.exe	wab.exe
PID 2268 wrote to memory of 2520	2268	powershell.exe	wab.exe
PID 2268 wrote to memory of 2520	2268	powershell.exe	wab.exe
PID 2520 wrote to memory of 1816	2520	wab.exe	cmd.exe
PID 2520 wrote to memory of 1816	2520	wab.exe	cmd.exe
PID 2520 wrote to memory of 1816	2520	wab.exe	cmd.exe
PID 2520 wrote to memory of 1816	2520	wab.exe	cmd.exe
PID 1816 wrote to memory of 2464	1816	cmd.exe	reg.exe
PID 1816 wrote to memory of 2464	1816	cmd.exe	reg.exe
PID 1816 wrote to memory of 2464	1816	cmd.exe	reg.exe
PID 1816 wrote to memory of 2464	1816	cmd.exe	reg.exe

C:\Users\Admin\AppData\Local\Temp\5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe
"C:\Users\Admin\AppData\Local\Temp\5997f5719c8272c35a0428f7cf2804f9eabb9e8260a9ed8f3e38807c8ba15a41.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:3024
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -windowstyle hidden "$Kernebiders=Get-Content 'C:\Users\Admin\AppData\Local\mesostoma\Vicomtesses\Rettelsens.Fun';$Henvisningsformaalenes=$Kernebiders.SubString(52381,3);.$Henvisningsformaalenes($Kernebiders)"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2268
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" "/c set /A 1^^0"
    3⤵
    PID:2588
- - C:\Program Files (x86)\windows mail\wab.exe
    "C:\Program Files (x86)\windows mail\wab.exe"
    3⤵
    - Suspicious use of NtCreateThreadExHideFromDebugger
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of WriteProcessMemory
    PID:2520
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Bladselleriens168" /t REG_EXPAND_SZ /d "%Dicyandiamide% -windowstyle minimized $Anillas=(Get-ItemProperty -Path 'HKCU:\Sufflr50\').Fanegas;%Dicyandiamide% ($Anillas)"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1816
    - - C:\Windows\SysWOW64\reg.exe
        
        REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Bladselleriens168" /t REG_EXPAND_SZ /d "%Dicyandiamide% -windowstyle minimized $Anillas=(Get-ItemProperty -Path 'HKCU:\Sufflr50\').Fanegas;%Dicyandiamide% ($Anillas)"
        5⤵
        Adds Run key to start application
        Modifies registry key
        
        PID:2464

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

Filesize
68KB

MD5
29f65ba8e88c063813cc50a4ea544e93

SHA1
05a7040d5c127e68c25d81cc51271ffb8bef3568

SHA256
1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

SHA512
e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

Download Submit
C:\Users\Admin\AppData\Local\mesostoma\Vicomtesses\Rettelsens.Fun

Filesize
51KB

MD5
6b26f241773f6d93d74baa158720f000

SHA1
27544fb26ed0f29e578e75086f237053f33d447b

SHA256
08c8481e9f4d40638f5754c9949884bc8ee962a5cc0dad71455f03043ad9ca1a

SHA512
f8d411c78094a180f9b5a4c0136df2c9f99d7fdf5dbc6842eb13bc96c062a93c7df666367deda8451a3c5e5a5eb17e33e6bd90b2482663a4acbebf38bd0ef19f

Download Submit
C:\Users\Admin\AppData\Local\mesostoma\Vicomtesses\Stoneite.Sub

Filesize
331KB

MD5
487bff0f93689ca23ac0bc1884bbc5a5

SHA1
c032d16c921940bcff3f40e4c7f051d4a7d3af74

SHA256
748d7d417c84a5655fd63d1563e01a9f65287c47e35a501516237497d123338d

SHA512
708e5026a25e5043c3c05e51a86e76d85b79d9ea3c032520e2cb7714a8e4a3fd1684356dcd30a99d721146f9b06e94f76c7e45d5b8606a0e3b0e981f7a8cb368

Download Submit
memory/2268-8-0x00000000744B1000-0x00000000744B2000-memory.dmp

Filesize
4KB

Download
memory/2268-9-0x00000000744B0000-0x0000000074A5B000-memory.dmp

Filesize
5.7MB

Download
memory/2268-10-0x00000000744B0000-0x0000000074A5B000-memory.dmp

Filesize
5.7MB

Download
memory/2268-11-0x00000000744B0000-0x0000000074A5B000-memory.dmp

Filesize
5.7MB

Download
memory/2268-12-0x00000000744B0000-0x0000000074A5B000-memory.dmp

Filesize
5.7MB

Download
memory/2268-16-0x0000000006910000-0x000000000C7CD000-memory.dmp

Filesize
94.7MB

Download
memory/2268-17-0x00000000744B0000-0x0000000074A5B000-memory.dmp

Filesize
5.7MB

Download
memory/2520-52-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/2520-53-0x0000000001500000-0x00000000073BD000-memory.dmp

Filesize
94.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads