MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed. 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


Efimer


Vendor detections: 11


Intelligence 11 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed
SHA3-384 hash: ecbe7f5f2dd60f19bdcf98a9fa38fdd996993f0dc893dd4bf2c8d1eebb15a3fc01068e3ba12a4022263c8483eee8d5fa
SHA1 hash: 91f1a89b15e43871f441917eea55c86baa083609
MD5 hash: 37a467e33e90d404c041e9f7d1de4727
humanhash: apart-texas-alabama-butter
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'297'783 bytes
First seen:2026-07-13 02:52:12 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (269 x Efimer, 60 x BlankGrabber, 22 x NetSupport)
ssdeep 393216:2rUw8dNgugziRaFNTqgjGXMCHWUjXccuI3/PGTAI:2wwY6u/oXugjGXMb8XJH/O7
TLSH T18EE6332416C006EFD6B3923DEDA21D65D2B6707F0732C8EB1BB4979A6E131E14C3E616
TrID 37.0% (.EXE) Win64 Executable (generic) (6522/11/2)
28.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
11.5% (.EXE) OS/2 Executable (generic) (2029/13)
11.3% (.EXE) Generic Win/DOS Executable (2002/3)
11.3% (.EXE) DOS Executable (generic) (2000/1)
Magika pebin
dhash icon e0b960c0dc797218 (2 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


Avatar
iamaachum
https://tuasesoriadigital.es/default.dat

Intelligence

File Origin
# of uploads :
1
# of downloads :
213
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/f92f9361-b9c4-4c4e-9237-2f23c8162e58/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/74389/
Detection(s):
SecuriteInfo.com.Variant.Dropper.354.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a5452fea53b0ea1c820edfc
Tags:
installer vmdetect shell sage
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a file in the %temp% subdirectories
Restart of the analyzed sample
Creating a window
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
anti-debug expand installer-heuristic lolbin masquerade microsoft_visual_cc overlay packed packed packed pyinstaller reconnaissance
Link:
https://www.filescan.io/uploads/6a5452f7b1e117d8f16915a1/reports/224afd3d-8d6c-4317-8520-b4e54b94a91b/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-13T00:14:00Z UTC
Last seen:
2026-07-14T20:19:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/134e0c95-37e1-4122-af7f-4ba418dfd5e1
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
72 / 100
Link:
https://www.joesandbox.com/analysis/1941316
Signature
Adds a directory exclusion to Windows Defender
Found pyInstaller with non standard icon
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Multi AV Scanner detection for submitted file
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Suspicious Script Execution From Temp Folder
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1941316 Sample: default.dat.exe Startdate: 13/07/2026 Architecture: WINDOWS Score: 72 56 Multi AV Scanner detection for submitted file 2->56 58 Joe Sandbox ML detected suspicious sample 2->58 60 Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet 2->60 62 Sigma detected: Suspicious Script Execution From Temp Folder 2->62 8 default.dat.exe 31 2->8         started        12 svchost.exe 1 1 2->12         started        process3 dnsIp4 46 C:\Users\user\AppData\...\unicodedata.pyd, PE32+ 8->46 dropped 48 C:\Users\user\AppData\Local\...\select.pyd, PE32+ 8->48 dropped 50 C:\Users\user\AppData\Local\...\python313.dll, PE32+ 8->50 dropped 52 15 other files (none is malicious) 8->52 dropped 66 Adds a directory exclusion to Windows Defender 8->66 68 Found pyInstaller with non standard icon 8->68 15 default.dat.exe 1 8->15         started        54 127.0.0.1 unknown unknown 12->54 file5 signatures6 process7 signatures8 72 Adds a directory exclusion to Windows Defender 15->72 18 cmd.exe 1 15->18         started        21 cmd.exe 1 15->21         started        23 cmd.exe 1 15->23         started        25 9 other processes 15->25 process9 signatures10 64 Adds a directory exclusion to Windows Defender 18->64 27 powershell.exe 23 18->27         started        30 conhost.exe 18->30         started        32 powershell.exe 23 21->32         started        34 conhost.exe 21->34         started        36 powershell.exe 23 23->36         started        38 conhost.exe 23->38         started        40 powershell.exe 25->40         started        42 powershell.exe 25->42         started        44 16 other processes 25->44 process11 signatures12 70 Loading BitLocker PowerShell Module 32->70
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed/
Threat name:
Win64.Trojan.Sonbokli
Create hunting rule
Status:
Malicious
First seen:
2026-07-13 02:53:45 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
18 of 37 (48.65%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=7zn3p4ptp2coytytywb6saqefdfoyuvh7xz3a3aichwrzzwye3wq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260713-dc3w6adv2t/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Loads dropped DLL
Command and Scripting Interpreter: PowerShell
Unpacked files
SH256 hash:
fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed
MD5 hash:
37a467e33e90d404c041e9f7d1de4727
SHA1 hash:
91f1a89b15e43871f441917eea55c86baa083609
Link:
https://www.unpac.me/results/6b8c0d64-c702-456f-b763-ac94a3a03f99/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/6b8c0d64-c702-456f-b763-ac94a3a03f99/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/6b8c0d64-c702-456f-b763-ac94a3a03f99/
SH256 hash:
aa305577690b3808a5f6fc5fef54f648ec104f999088dbaadd4557b1582eae74
MD5 hash:
53f5ede03fa36acbf5d2cef3c51b69c2
SHA1 hash:
96530463460b254c06adfa18e4b586c200ee16c4
Link:
https://www.unpac.me/results/6b8c0d64-c702-456f-b763-ac94a3a03f99/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed

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:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerException__SetConsoleCtrl
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Detect_PyInstaller
Create hunting rule
Author:Obscurity Labs LLC
Description:Detects PyInstaller compiled executables across platforms
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:PyInstaller
Create hunting rule
Author:@bartblaze
Description:Identifies executable converted using PyInstaller. This rule by itself does NOT necessarily mean the detected file is malicious.
Rule name:TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE
Create hunting rule
Author:CYFARE
Description:Detects Windows malware employing anti-VM / anti-sandbox evasion techniques across VMware, VirtualBox, Hyper-V, QEMU, Xen, and generic sandbox environments
Reference:https://cyfare.net/
Rule name:upxHook
Create hunting rule
Author:@r3dbU7z
Description:Detect artifacts from 'upxHook' - modification of UPX packer
Reference:https://bazaar.abuse.ch/sample/6352be8aa5d8063673aa428c3807228c40505004320232a23d99ebd9ef48478a/

File information

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

Web download

Efimer

Executable exe fe5bb7f1f37e84ec4f13c583e9020428caec52a7fdf3b06c0811ed1ce6d826ed

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/74389/

Comments