guloader | 1ae1583b2be5c21f228a0e925652c9f5013bddf699548ca39b02670576325010

Analysis

max time kernel
152s
max time network
157s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
24/04/2024, 01:00

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General

Target

6000507958.exe
Size

563KB
MD5

e0d35d2fe887cbe0b4de87f1be7d7a17
SHA1

b37f59b0ec54d6c40645837dbb3a18c954346601
SHA256

1ae1583b2be5c21f228a0e925652c9f5013bddf699548ca39b02670576325010
SHA512

9d20fd479a57ccf51c02830744f095b5dfa98707777a8f24968aa0f0e9ac2a4de4ae348831a001b00cae9d750b9372a85248fdd15570a44ca52b90f8cf451256
SSDEEP

12288:8stfWr2z5t/dtpQBEd6XT9Pi8RzDm+EYRfT7d+:8st+r2z5J9Pd6XT9Pi85REYpT7d+

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
4248	6000507958.exe
2932	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
2932	Brookier.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4104	powershell.exe
2932	Brookier.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 4104 set thread context of 2932	4104	powershell.exe	103
PID 2932 set thread context of 3348	2932	Brookier.exe	57
PID 2932 set thread context of 3184	2932	Brookier.exe	107
PID 3184 set thread context of 3348	3184	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/0x0008000000023260-51.dat	nsis_installer_1
behavioral2/files/0x0008000000023260-51.dat	nsis_installer_2

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
2228	reg.exe

Suspicious behavior: EnumeratesProcesses 43 IoCs

pid	Process
4104	powershell.exe
4104	powershell.exe
4104	powershell.exe
4104	powershell.exe
4104	powershell.exe
4104	powershell.exe
4104	powershell.exe
4104	powershell.exe
4104	powershell.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
2932	Brookier.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe
3184	cmd.exe

Suspicious behavior: MapViewOfSection 6 IoCs

pid	Process
4104	powershell.exe
2932	Brookier.exe
3348	Explorer.EXE
3348	Explorer.EXE
3184	cmd.exe
3184	cmd.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4104	powershell.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 4104	4248	6000507958.exe	91
PID 4248 wrote to memory of 4104	4248	6000507958.exe	91
PID 4248 wrote to memory of 4104	4248	6000507958.exe	91
PID 4104 wrote to memory of 1592	4104	powershell.exe	93
PID 4104 wrote to memory of 1592	4104	powershell.exe	93
PID 4104 wrote to memory of 1592	4104	powershell.exe	93
PID 4104 wrote to memory of 2932	4104	powershell.exe	103
PID 4104 wrote to memory of 2932	4104	powershell.exe	103
PID 4104 wrote to memory of 2932	4104	powershell.exe	103
PID 4104 wrote to memory of 2932	4104	powershell.exe	103
PID 4104 wrote to memory of 2932	4104	powershell.exe	103
PID 2932 wrote to memory of 1652	2932	Brookier.exe	104
PID 2932 wrote to memory of 1652	2932	Brookier.exe	104
PID 2932 wrote to memory of 1652	2932	Brookier.exe	104
PID 1652 wrote to memory of 2228	1652	cmd.exe	106
PID 1652 wrote to memory of 2228	1652	cmd.exe	106
PID 1652 wrote to memory of 2228	1652	cmd.exe	106
PID 3348 wrote to memory of 3184	3348	Explorer.EXE	107
PID 3348 wrote to memory of 3184	3348	Explorer.EXE	107
PID 3348 wrote to memory of 3184	3348	Explorer.EXE	107

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3348
- 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:4248
- - 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:4104
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c "set /A 1^^0"
      4⤵
      PID:1592
  - - 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:2932
    - - 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:1652
      - 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:2228
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\SysWOW64\cmd.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  PID:3184

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=4076 --field-trial-handle=2900,i,14549994492153927475,12895178890800740987,262144 --variations-seed-version /prefetch:8
1⤵
PID:5084

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

C:\Users\Admin\AppData\Local\Temp\Brookier.exe

Filesize
563KB

MD5
e0d35d2fe887cbe0b4de87f1be7d7a17

SHA1
b37f59b0ec54d6c40645837dbb3a18c954346601

SHA256
1ae1583b2be5c21f228a0e925652c9f5013bddf699548ca39b02670576325010

SHA512
9d20fd479a57ccf51c02830744f095b5dfa98707777a8f24968aa0f0e9ac2a4de4ae348831a001b00cae9d750b9372a85248fdd15570a44ca52b90f8cf451256

Download Submit
C:\Users\Admin\AppData\Local\Temp\Moviedom230\Devenustate\Accorder\Uncoincidental\Incurvity.eft

Filesize
76KB

MD5
465454d4effb2dd4458e8032988455d0

SHA1
3afe548209cfe0721b65fbd2b4b6019354d0d59f

SHA256
02e8b4c4053f7f4352c533a46471ab963a86a8156267cdffeb74c0374d2c4c79

SHA512
c4a6031758908fe6b48046ab25f88a8983e63c95a6d94542a4e8812d172009f72020a842ee92f42742f15665eaed3e20cd6cf3cd2f166b7ceb2306ffbcceef3d

Download Submit
C:\Users\Admin\AppData\Local\Temp\Moviedom230\Ringspinderne.Eks

Filesize
336KB

MD5
3295c50e6679be9cda4405ea4aece7bb

SHA1
6361360fef5d23ee39c4ea42ea48d00e5952ad9a

SHA256
698751c6b65fa692eace874966db90257c8166210c739be6d00a35053a30f2fa

SHA512
b21f13cecb5c481ca1d951847a4b54881b37c868ada0d54b39d2e784a7fc8acac7d56be1063c2090a053400fe0f149b5450d5afa840153f234ff3f08770bdcf6

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_05agrwko.vzw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\nssF31B.tmp\nsExec.dll

Filesize
6KB

MD5
5aa38904acdcc21a2fb8a1d30a72d92f

SHA1
a9ce7d1456698921791db91347dba0489918d70c

SHA256
10675f13abaee592f14382349aa35d82fb52aab4e27eef61d0c83dec1f6b73da

SHA512
f04740da561d7cd0dea5e839c9e1c339d4a3e63944d3566c94c921a3d170a69918a32dff3f3b43f13d55cc25a2dbb4c21104f062c324308ac5104179766402a3

Download Submit
memory/2932-68-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-63-0x0000000001660000-0x0000000002146000-memory.dmp

Filesize
10.9MB

Download
memory/2932-52-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-53-0x0000000001660000-0x0000000002146000-memory.dmp

Filesize
10.9MB

Download
memory/2932-79-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-54-0x0000000077A28000-0x0000000077A29000-memory.dmp

Filesize
4KB

Download
memory/2932-77-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-55-0x00000000779A1000-0x0000000077AC1000-memory.dmp

Filesize
1.1MB

Download
memory/2932-75-0x00000000000E0000-0x00000000000FC000-memory.dmp

Filesize
112KB

Download
memory/2932-56-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-81-0x0000000001660000-0x0000000002146000-memory.dmp

Filesize
10.9MB

Download
memory/2932-73-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-64-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-70-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2932-69-0x000000001E4A0000-0x000000001E7EA000-memory.dmp

Filesize
3.3MB

Download
memory/2932-66-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3184-86-0x0000000000E20000-0x0000000000EBB000-memory.dmp

Filesize
620KB

Download
memory/3184-85-0x0000000000600000-0x000000000063F000-memory.dmp

Filesize
252KB

Download
memory/3184-83-0x0000000000E20000-0x0000000000EBB000-memory.dmp

Filesize
620KB

Download
memory/3184-76-0x0000000000600000-0x000000000063F000-memory.dmp

Filesize
252KB

Download
memory/3184-78-0x0000000000600000-0x000000000063F000-memory.dmp

Filesize
252KB

Download
memory/3184-82-0x0000000000600000-0x000000000063F000-memory.dmp

Filesize
252KB

Download
memory/3184-80-0x0000000000F30000-0x000000000127A000-memory.dmp

Filesize
3.3MB

Download
memory/3348-84-0x000000000D5B0000-0x000000000EBA3000-memory.dmp

Filesize
21.9MB

Download
memory/3348-74-0x000000000D5B0000-0x000000000EBA3000-memory.dmp

Filesize
21.9MB

Download
memory/4104-31-0x0000000006CB0000-0x0000000006CCA000-memory.dmp

Filesize
104KB

Download
memory/4104-49-0x00000000779A1000-0x0000000077AC1000-memory.dmp

Filesize
1.1MB

Download
memory/4104-48-0x00000000090C0000-0x0000000009BA6000-memory.dmp

Filesize
10.9MB

Download
memory/4104-47-0x0000000005340000-0x0000000005350000-memory.dmp

Filesize
64KB

Download
memory/4104-46-0x0000000005340000-0x0000000005350000-memory.dmp

Filesize
64KB

Download
memory/4104-45-0x0000000005340000-0x0000000005350000-memory.dmp

Filesize
64KB

Download
memory/4104-44-0x0000000005340000-0x0000000005350000-memory.dmp

Filesize
64KB

Download
memory/4104-42-0x00000000090C0000-0x0000000009BA6000-memory.dmp

Filesize
10.9MB

Download
memory/4104-41-0x0000000073F40000-0x00000000746F0000-memory.dmp

Filesize
7.7MB

Download
memory/4104-40-0x00000000090C0000-0x0000000009BA6000-memory.dmp

Filesize
10.9MB

Download
memory/4104-65-0x0000000073F40000-0x00000000746F0000-memory.dmp

Filesize
7.7MB

Download
memory/4104-67-0x00000000090C0000-0x0000000009BA6000-memory.dmp

Filesize
10.9MB

Download
memory/4104-39-0x0000000007CE0000-0x0000000007CE4000-memory.dmp

Filesize
16KB

Download
memory/4104-37-0x0000000005340000-0x0000000005350000-memory.dmp

Filesize
64KB

Download
memory/4104-35-0x0000000008A40000-0x00000000090BA000-memory.dmp

Filesize
6.5MB

Download
memory/4104-33-0x0000000007E10000-0x00000000083B4000-memory.dmp

Filesize
5.6MB

Download
memory/4104-32-0x0000000006D00000-0x0000000006D22000-memory.dmp

Filesize
136KB

Download
memory/4104-30-0x0000000007770000-0x0000000007806000-memory.dmp

Filesize
600KB

Download
memory/4104-29-0x0000000005340000-0x0000000005350000-memory.dmp

Filesize
64KB

Download
memory/4104-28-0x00000000067E0000-0x000000000682C000-memory.dmp

Filesize
304KB

Download
memory/4104-27-0x00000000067C0000-0x00000000067DE000-memory.dmp

Filesize
120KB

Download
memory/4104-23-0x00000000061E0000-0x0000000006534000-memory.dmp

Filesize
3.3MB

Download
memory/4104-21-0x0000000006170000-0x00000000061D6000-memory.dmp

Filesize
408KB

Download
memory/4104-15-0x0000000006090000-0x00000000060F6000-memory.dmp

Filesize
408KB

Download
memory/4104-14-0x0000000005FF0000-0x0000000006012000-memory.dmp

Filesize
136KB

Download
memory/4104-13-0x0000000005980000-0x0000000005FA8000-memory.dmp

Filesize
6.2MB

Download
memory/4104-12-0x00000000051D0000-0x0000000005206000-memory.dmp

Filesize
216KB

Download
memory/4104-11-0x0000000005340000-0x0000000005350000-memory.dmp

Filesize
64KB

Download
memory/4104-10-0x0000000073F40000-0x00000000746F0000-memory.dmp

Filesize
7.7MB

Download