MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


GuLoader


Vendor detections: 14


Intelligence 14 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd
SHA3-384 hash: 84b8c069d0f306f7760910cf5a1f4ffdfeb752d1e8dcd8b57a15a74d911e4e75c9e07c2f304dc97a737e51e79625f8fc
SHA1 hash: 4eb5c4db67655932f0d904dc037b44b0d486158c
MD5 hash: 1b2cbeac6edcd04ca160e8f73275d58e
humanhash: social-texas-mountain-fanta
File name:Purchase Order 098922.scr
Download: download sample
Signature GuLoader
Create hunting rule
File size:572'518 bytes
First seen:2024-10-07 08:12:02 UTC
Last seen:2024-10-07 08:33:48 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 0293eec0b5432ad092f24065016203b2 (21 x GuLoader, 9 x RemcosRAT, 6 x Formbook)
ssdeep 12288:oXXR47mwO8E0dAjNWiyfp0/mms22qBTO7hIB+J2W+ei:KXR47NTEWANRZsHgC7Y+AWm
Threatray 2'575 similar samples on MalwareBazaar
TLSH T173C402073734AAA6DA3E17F176AB0BCD43688D274E51450F3668BB312EB23025D5E5CE
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10523/12/4)
9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
7.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
6.8% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika pebin
File icon (PE):PE icon
dhash icon 008088948cccf000 (1 x RemcosRAT, 1 x GuLoader)
Reporter adrian__luca
Tags:exe GuLoader

Intelligence

File Origin
# of uploads :
2
# of downloads :
351
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Purchase Order 098922.scr
Verdict:
Malicious activity
Analysis date:
2024-10-07 08:42:52 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/c08f8a60-ecce-46e7-b679-44e6fa9e4631

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.FileRepMalware.9965.19427.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
93.3%
Link:
https://cyber-fortress.com/docs/result/index.php?id=670397f5ebeac9e680512dee
Tags:
Powershell Nsis
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
installer lolbin masquerade microsoft_visual_cc overlay packed shell32
Link:
https://www.filescan.io/uploads/670397e806f0c2314b429997/reports/9bc5e69a-555f-4b4b-a14f-bd078bae92a6/overview
Verdict:
Malicious
Labled as:
Trojan.GenericFCA.Agent
Link:
https://www.hybrid-analysis.com/sample/3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd
Result
Verdict:
MALICIOUS
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/3620733c-bdae-48c8-b92f-27fcafe804ac
Result
Threat name:
GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
92 / 100
Link:
https://www.joesandbox.com/analysis/1527822
Signature
Initial sample is a PE file and has a suspicious name
Machine Learning detection for sample
Mass process execution to delay analysis
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Obfuscated command line found
Switches to a custom stack to bypass stack traces
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1527822 Sample: Purchase Order 098922.scr.exe Startdate: 07/10/2024 Architecture: WINDOWS Score: 92 38 telesavers.co.za 2->38 40 Multi AV Scanner detection for domain / URL 2->40 42 Multi AV Scanner detection for submitted file 2->42 44 Yara detected GuLoader 2->44 46 5 other signatures 2->46 8 Purchase Order 098922.scr.exe 1 32 2->8         started        signatures3 process4 file5 34 C:\Users\user\AppData\Local\...\nsExec.dll, PE32 8->34 dropped 36 C:\Users\user\AppData\Local\...\System.dll, PE32 8->36 dropped 48 Obfuscated command line found 8->48 12 cmd.exe 8->12         started        14 cmd.exe 8->14         started        16 cmd.exe 8->16         started        18 62 other processes 8->18 signatures6 process7 process8 20 Conhost.exe 12->20         started        22 Conhost.exe 14->22         started        24 Conhost.exe 16->24         started        26 Conhost.exe 18->26         started        28 Conhost.exe 18->28         started        30 Conhost.exe 18->30         started        32 58 other processes 18->32
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd/
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2024-09-30 12:32:35 UTC
File Type:
PE (Exe)
Extracted files:
11
AV detection:
22 of 38 (57.89%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=hkfskts5ok6yizmjr47x2oxxghaqhlihwbskpd4aw3yeeij4m26q._file
Verdict:
malicious
Label(s):
packer_bxor
Create hunting rule
Similar samples:
24c6d52deb03904ffdfab367e71f0bd7339495d8684a6b23b4bf7e0678986af9
GuLoader
3c969a06b2e8fe7fc4ad81ca5005713f4c9638c6ad36be3949fea7a0cea62204
GuLoader
87a8c6294c7bfeece375857edf3b1a16a2a7c1d42fc9f2463e31f45b36135ef1
GuLoader
97cc634556982a9330804566cd2cd6b2fd0b9be5048de247d8b40cfdb4c1a1ec
GuLoader
c23a686bae9a2a6cdf2038427faca4bef69d69108c934ea79992eff2aca47ece
GuLoader
defaa7299868b133e17be2d9e306ffe90b6fee35f5efdc6b234593f5321d9ee5
GuLoader
error
GuLoader
f597a169eff0fcb60de34630635da598c0b90ff4c96764844d0aebca18fa3988
GuLoader
fe0ebb0420900acf0275c41641ae45ce2bb9d581ffa67b4a9897336be4fcd9fc
GuLoader
+ 2'565 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost discovery rat
Link:
https://tria.ge/reports/241007-j3x2gsvelm/
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
System Location Discovery: System Language Discovery
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Loads dropped DLL
Remcos
Malware Config
C2 Extraction:
kezdns.pro:2404
Verdict:
Malicious
Tags:
loader guloader
YARA:
NSIS_GuLoader_July_2024
Link:
https://app.threat.zone/submission/31890093-e9b8-4cce-9a3e-d68b23078776
Unpacked files
SH256 hash:
7fb0f8d452fefaac789986b933df050f3d3e4feb8a8d9944ada995f572dcdca1
MD5 hash:
dd87a973e01c5d9f8e0fcc81a0af7c7a
SHA1 hash:
c9206ced48d1e5bc648b1d0f54cccc18bf643a14
Link:
https://www.unpac.me/results/283202a3-5338-47fc-b7be-de04feeec3fa/
SH256 hash:
bcb93204bd1854d0c34fa30883bab51f6813ab32abf7fb7d4aeed21d71f6af87
MD5 hash:
6c881f00ba860b17821d8813aa34dbc6
SHA1 hash:
0e5a1e09b1ce1bc758d6977b913a8d9ccbe52a13
Link:
https://www.unpac.me/results/283202a3-5338-47fc-b7be-de04feeec3fa/
SH256 hash:
832da3cff792135ecb98f44c387bea3a8e2e9bd096b917303ca8b9dc71d60365
MD5 hash:
50a9396a761bf245ed4df1b08782d6f2
SHA1 hash:
e01a99100e91801abe074341b0c77cca6220f0bd
Link:
https://www.unpac.me/results/283202a3-5338-47fc-b7be-de04feeec3fa/
SH256 hash:
3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd
MD5 hash:
1b2cbeac6edcd04ca160e8f73275d58e
SHA1 hash:
4eb5c4db67655932f0d904dc037b44b0d486158c
Link:
https://www.unpac.me/results/283202a3-5338-47fc-b7be-de04feeec3fa/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
GuLoader
Score:
0.90
Link:
https://yomi.yoroi.company/submissions/3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:Ins_NSIS_Buer_Nov_2020_1
Create hunting rule
Author:Arkbird_SOLG
Description:Detect NSIS installer used for Buer loader
Rule name:NSIS_GuLoader
Create hunting rule
Author:NDA0E
Description:Detects GuLoader using NSIS
Rule name:NSIS_GuLoader_July_2024
Create hunting rule
Author:NDA0E
Description:Detects GuLoader packed with NSIS installer
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Malspam

GuLoader

Executable exe 3a8b254e5d72bd8465898f3f7d3af731c103ad07b064a78f80b6f042213c66bd

(this sample)

  
Delivery method
Distributed via e-mail attachment

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high
Reviews
IDCapabilitiesEvidence
COM_BASE_APICan Download & Execute componentsole32.dll::CoCreateInstance
SECURITY_BASE_APIUses Security Base APIADVAPI32.dll::AdjustTokenPrivileges
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteExA
SHELL32.dll::SHFileOperationA
SHELL32.dll::SHGetFileInfoA
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CreateProcessA
ADVAPI32.dll::OpenProcessToken
KERNEL32.dll::CloseHandle
KERNEL32.dll::CreateThread
WIN_BASE_APIUses Win Base APIKERNEL32.dll::LoadLibraryExA
KERNEL32.dll::GetDiskFreeSpaceA
KERNEL32.dll::GetCommandLineA
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CopyFileA
KERNEL32.dll::CreateDirectoryA
KERNEL32.dll::CreateFileA
KERNEL32.dll::DeleteFileA
KERNEL32.dll::MoveFileA
KERNEL32.dll::MoveFileExA
WIN_BASE_USER_APIRetrieves Account InformationADVAPI32.dll::LookupPrivilegeValueA
WIN_REG_APICan Manipulate Windows RegistryADVAPI32.dll::RegCreateKeyExA
ADVAPI32.dll::RegDeleteKeyA
ADVAPI32.dll::RegOpenKeyExA
ADVAPI32.dll::RegQueryValueExA
ADVAPI32.dll::RegSetValueExA
WIN_USER_APIPerforms GUI ActionsUSER32.dll::AppendMenuA
USER32.dll::EmptyClipboard
USER32.dll::FindWindowExA
USER32.dll::OpenClipboard
USER32.dll::PeekMessageA
USER32.dll::CreateWindowExA

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