guloader | 72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23

General

Target

72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
Size

751KB
MD5

455b5452ab7cc1d908fa70d7745a96fd
SHA1

6fdbeda74a6d56453149e907b707cdd5ff7a193b
SHA256

72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23
SHA512

5e1687bd999369569202ac1b8255289cc75b0c0b2d0d54ab9c05676a7d37554bab09dbd38b4c45cd5d60cd56de9bcfc2efb7cf6d649679e938d7ddf0c3f436ad
SSDEEP

12288:pX9/Od/QKZlFhOeTp/muQrOnpCirVUkstBLyywCwOD/Wh:pXRY/bHt/FQOncFHp

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Loads dropped DLL 2 IoCs

pid	Process
3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\cellefngsler\zoofysiologis.Tek51	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
532	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
532	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\overlevelses.con	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
File opened for modification	C:\Program Files (x86)\optrkkerens\Desparple197.ini	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\posttest.ini	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.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 2 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	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
532	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
532	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3712 wrote to memory of 532	3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe	89
PID 3712 wrote to memory of 532	3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe	89
PID 3712 wrote to memory of 532	3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe	89
PID 3712 wrote to memory of 532	3712	72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe	89

C:\Users\Admin\AppData\Local\Temp\72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
"C:\Users\Admin\AppData\Local\Temp\72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3712
- C:\Users\Admin\AppData\Local\Temp\72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe
  "C:\Users\Admin\AppData\Local\Temp\72433c6e5c9594689111646fbf25edacc240f028664b0216559aa5952ca3ec23.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:532

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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\Temp\nso83C7.tmp\System.dll

Filesize
12KB

MD5
4add245d4ba34b04f213409bfe504c07

SHA1
ef756d6581d70e87d58cc4982e3f4d18e0ea5b09

SHA256
9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706

SHA512
1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d

Download Submit
memory/532-33-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-34-0x0000000001660000-0x0000000006782000-memory.dmp

Filesize
81.1MB

Download
memory/532-41-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-30-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-29-0x0000000001660000-0x0000000006782000-memory.dmp

Filesize
81.1MB

Download
memory/532-31-0x0000000077D98000-0x0000000077D99000-memory.dmp

Filesize
4KB

Download
memory/532-40-0x0000000000401000-0x0000000000404000-memory.dmp

Filesize
12KB

Download
memory/532-32-0x0000000077DB5000-0x0000000077DB6000-memory.dmp

Filesize
4KB

Download
memory/532-35-0x0000000000401000-0x0000000000404000-memory.dmp

Filesize
12KB

Download
memory/532-39-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-36-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-37-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/532-38-0x0000000077D11000-0x0000000077E31000-memory.dmp

Filesize
1.1MB

Download
memory/3712-26-0x0000000077D11000-0x0000000077E31000-memory.dmp

Filesize
1.1MB

Download
memory/3712-27-0x0000000077D11000-0x0000000077E31000-memory.dmp

Filesize
1.1MB

Download
memory/3712-28-0x0000000075035000-0x0000000075036000-memory.dmp

Filesize
4KB

Download

Analysis

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