guloader | 88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05

Analysis

max time kernel
145s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
26/03/2025, 15:41

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General

Target

88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe
Size

710KB
MD5

7fd7dd397e516148853d67da226421ee
SHA1

dd29f965861e967717619c3430642e508aefda76
SHA256

88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05
SHA512

d33e3cb5cf12ae987f04319dc55c1e082504c3dd2741531fb087133a3c5e64fef7ed3117474554533ef198021313ec6e550ea8997aae225efedc82ff384d04e4
SSDEEP

12288:K/fYDG1Q4p14mNq+/FppPh9JGF7eTN+NFbl5Pj0spM86:+fGoQff+/FpdKOMzxjJ

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 1 IoCs

pid	Process
3968	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3968	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe
1596	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Buddie\afvnning.opb	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.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	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3968	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3968 wrote to memory of 1596	3968	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	112
PID 3968 wrote to memory of 1596	3968	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	112
PID 3968 wrote to memory of 1596	3968	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	112
PID 3968 wrote to memory of 1596	3968	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	112

C:\Users\Admin\AppData\Local\Temp\88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe
"C:\Users\Admin\AppData\Local\Temp\88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3968
- C:\Users\Admin\AppData\Local\Temp\88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe
  "C:\Users\Admin\AppData\Local\Temp\88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:1596

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsw2259.tmp\System.dll

Filesize
11KB

MD5
8b3830b9dbf87f84ddd3b26645fed3a0

SHA1
223bef1f19e644a610a0877d01eadc9e28299509

SHA256
f004c568d305cd95edbd704166fcd2849d395b595dff814bcc2012693527ac37

SHA512
d13cfd98db5ca8dc9c15723eee0e7454975078a776bce26247228be4603a0217e166058ebadc68090afe988862b7514cb8cb84de13b3de35737412a6f0a8ac03

Download Submit
memory/1596-26-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/1596-28-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/1596-29-0x0000000001660000-0x00000000037A2000-memory.dmp

Filesize
33.3MB

Download
memory/3968-21-0x0000000004D90000-0x0000000006ED2000-memory.dmp

Filesize
33.3MB

Download
memory/3968-23-0x0000000077361000-0x0000000077481000-memory.dmp

Filesize
1.1MB

Download
memory/3968-22-0x0000000004D90000-0x0000000006ED2000-memory.dmp

Filesize
33.3MB

Download
memory/3968-24-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/3968-27-0x0000000004D90000-0x0000000006ED2000-memory.dmp

Filesize
33.3MB

Download