MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a. 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: ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a
SHA3-384 hash: 9e91071e314434e2210eec992d45069e7ea3862475939a40708d774c3692b7b081543477cdfff4cf6f96c3c18cd527c1
SHA1 hash: 55c7111e401ba12047133ae8ab5ca236006412a0
MD5 hash: ba67288a05cab908dcebe00878bf9024
humanhash: angel-aspen-wyoming-seventeen
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'281'422 bytes
First seen:2026-07-20 17:52:27 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (657 x Efimer, 60 x BlankGrabber, 23 x SalatStealer)
ssdeep 393216:1EtXgmcd80i4HLQ0xtlMXMCHWUjXicuI3/PGTAI:1Ch2LpRMXMb8XfH/O7
TLSH T15CE6332865E052BDD277003CEEF22182D66674AB0736C5DF1BB88BF52E172E0493D75A
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 18dcf8f8fcf8e042 (1 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
204
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/eaf22a46-44b7-4928-be5e-dcc02fe50933/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/75457/
Detection(s):
SecuriteInfo.com.Variant.Dropper.354.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
94.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a5e606785479d70bfb7869b
Tags:
installer 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/6a5e60676e5e07f797f51fe4/reports/91db67b1-503c-4461-b8b6-ea2f17b68ee7/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-20T15:17:00Z UTC
Last seen:
2026-07-21T17:25:00Z UTC
Hits:
~10
Detections:
Trojan-PSW.Win32.Coins.sb Trojan-PSW.MSIL.Stealer.sb HEUR:Trojan.Python.Agent.gen HEUR:Trojan-PSW.Python.Agent.gen
Link:
https://opentip.kaspersky.com/ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/6704225a-7aab-40f3-aa6e-ab29617830d4
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
72 / 100
Link:
https://www.joesandbox.com/analysis/1945398
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: 1945398 Sample: default.dat.exe Startdate: 20/07/2026 Architecture: WINDOWS Score: 72 51 Multi AV Scanner detection for submitted file 2->51 53 Joe Sandbox ML detected suspicious sample 2->53 55 Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet 2->55 57 Sigma detected: Suspicious Script Execution From Temp Folder 2->57 8 default.dat.exe 31 2->8         started        process3 file4 43 C:\Users\user\AppData\...\unicodedata.pyd, PE32+ 8->43 dropped 45 C:\Users\user\AppData\Local\...\select.pyd, PE32+ 8->45 dropped 47 C:\Users\user\AppData\Local\...\python313.dll, PE32+ 8->47 dropped 49 15 other files (none is malicious) 8->49 dropped 61 Adds a directory exclusion to Windows Defender 8->61 63 Found pyInstaller with non standard icon 8->63 12 default.dat.exe 1 8->12         started        signatures5 process6 signatures7 65 Adds a directory exclusion to Windows Defender 12->65 15 cmd.exe 1 12->15         started        18 cmd.exe 1 12->18         started        20 cmd.exe 1 12->20         started        22 9 other processes 12->22 process8 signatures9 67 Adds a directory exclusion to Windows Defender 15->67 24 powershell.exe 23 15->24         started        27 conhost.exe 15->27         started        29 powershell.exe 23 18->29         started        31 conhost.exe 18->31         started        33 powershell.exe 23 20->33         started        35 conhost.exe 20->35         started        37 powershell.exe 22->37         started        39 powershell.exe 22->39         started        41 16 other processes 22->41 process10 signatures11 59 Loading BitLocker PowerShell Module 24->59
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a/
Threat name:
Win64.Trojan.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-20 17:54:05 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
16 of 38 (42.11%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=76edqguzmlwep2gj5p3weswsznobb3ev75xkz4rvu3qjncujb4va._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260720-wf3dxabz9s/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Executes a command shell one-liner
Loads dropped DLL
Command and Scripting Interpreter: PowerShell
Unpacked files
SH256 hash:
ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a
MD5 hash:
ba67288a05cab908dcebe00878bf9024
SHA1 hash:
55c7111e401ba12047133ae8ab5ca236006412a0
Link:
https://www.unpac.me/results/d6f548e7-7c9b-4479-a8d3-acc32e502184/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/d6f548e7-7c9b-4479-a8d3-acc32e502184/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/d6f548e7-7c9b-4479-a8d3-acc32e502184/
SH256 hash:
cb291d0089f1829d4b344627ffc55164746c4792e75b6a6669e811d2d0c6a052
MD5 hash:
4eed01876d6899732e6375a5d8c91905
SHA1 hash:
42e87a5443c56edc0ba94cf425216fa75a7a88a2
Link:
https://www.unpac.me/results/d6f548e7-7c9b-4479-a8d3-acc32e502184/
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/ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a

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 ff88381a9962ec47e8c9ebf7624ad2cb5c10ec95ff6eacf235a6e0968a890f2a

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/75457/

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