guloader | 88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05

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
2908	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2908	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

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2736	2680	WerFault.exe	30

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
2908	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2908 wrote to memory of 2680	2908	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	30
PID 2908 wrote to memory of 2680	2908	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	30
PID 2908 wrote to memory of 2680	2908	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	30
PID 2908 wrote to memory of 2680	2908	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	30
PID 2908 wrote to memory of 2680	2908	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	30
PID 2680 wrote to memory of 2736	2680	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	31
PID 2680 wrote to memory of 2736	2680	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	31
PID 2680 wrote to memory of 2736	2680	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	31
PID 2680 wrote to memory of 2736	2680	88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe	31

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:2908
- C:\Users\Admin\AppData\Local\Temp\88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe
  "C:\Users\Admin\AppData\Local\Temp\88f9977bcf2e69bfae14a36a9b12c1a3ab14ac8de5c42cf27dc61d1a717d5a05.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2680
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2680 -s 104
    3⤵
    - Program crash
    PID:2736

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

\Users\Admin\AppData\Local\Temp\nsy94D1.tmp\System.dll

Filesize
11KB

MD5
8b3830b9dbf87f84ddd3b26645fed3a0

SHA1
223bef1f19e644a610a0877d01eadc9e28299509

SHA256
f004c568d305cd95edbd704166fcd2849d395b595dff814bcc2012693527ac37

SHA512
d13cfd98db5ca8dc9c15723eee0e7454975078a776bce26247228be4603a0217e166058ebadc68090afe988862b7514cb8cb84de13b3de35737412a6f0a8ac03

Download Submit
memory/2680-26-0x0000000001470000-0x00000000035B2000-memory.dmp

Filesize
33.3MB

Download
memory/2680-27-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2680-29-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2908-22-0x0000000003B90000-0x0000000005CD2000-memory.dmp

Filesize
33.3MB

Download
memory/2908-23-0x0000000077B91000-0x0000000077C92000-memory.dmp

Filesize
1.0MB

Download
memory/2908-25-0x0000000077B90000-0x0000000077D39000-memory.dmp

Filesize
1.7MB

Download
memory/2908-24-0x0000000003B90000-0x0000000005CD2000-memory.dmp

Filesize
33.3MB

Download

Analysis

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