MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2. 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: 39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2
SHA3-384 hash: 1e1e3c1fe1dc5b2b269a0bc36148cd465fdb1edd112f6f8b74a8a757cb96cd20945067fb970fe36bb554f160a3a5e961
SHA1 hash: 2bc6800a208b92cd5629f0f64505871b33f62f2d
MD5 hash: e5d1adc01b9b1ca525909358a97bfa3a
humanhash: thirteen-lemon-coffee-may
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'305'279 bytes
First seen:2026-07-20 16:52:12 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (471 x Efimer, 60 x BlankGrabber, 22 x SalatStealer)
ssdeep 393216:5gZeGLJxrKEvTb+DRRXMCHWUjXecuI3/PGTAI:5gzjrKyTbQRXMb8XTH/O7
TLSH T1E1E63358BAD052FEC573513DDEE241A5D9ACB83317B2C49F1B8882A5BE131E44E3DA13
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 71f8fcdccce4f070 (3 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
210
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/7cd4c21c-877c-4d2f-9063-b9d01371688c/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/75454/
Detection(s):
SecuriteInfo.com.Variant.Dropper.354.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
97.4%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a5e525385479d70bfb7861d
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/6a5e524ccea680ae3b378ad6/reports/379cd00a-6833-4575-b502-7e45fe84f03f/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-20T14:16:00Z UTC
Last seen:
2026-07-21T17:25:00Z UTC
Hits:
~10
Detections:
HEUR:Trojan.Python.Agent.gen HEUR:Trojan-PSW.Python.Agent.gen Trojan-PSW.Win32.Coins.sb Trojan-PSW.MSIL.Stealer.sb
Link:
https://opentip.kaspersky.com/39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/706dee38-dc01-4428-bb7d-85f4e613a48e
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
72 / 100
Link:
https://www.joesandbox.com/analysis/1945366
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: 1945366 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 16 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 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 22->37         started        39 powershell.exe 22->39         started        41 16 other processes 22->41 process10 signatures11 59 Loading BitLocker PowerShell Module 37->59
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable PDB Path PE (Portable Executable) PE File Layout Win 64 Exe x64
Link:
https://app.malva.re/file/e5d1adc01b9b1ca525909358a97bfa3a
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2/
Threat name:
Win64.Trojan.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-20 16:53:57 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
15 of 38 (39.47%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=hhwjktlgwjee64typjrmyrzpyhem7fiefqw24hqel6lsompokhra._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260720-vdmd8sgx2k/
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:
39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2
MD5 hash:
e5d1adc01b9b1ca525909358a97bfa3a
SHA1 hash:
2bc6800a208b92cd5629f0f64505871b33f62f2d
Link:
https://www.unpac.me/results/690b104a-4634-4816-9b7b-c011313aa18b/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/690b104a-4634-4816-9b7b-c011313aa18b/
SH256 hash:
527204fe211fc8cbbe411551250ae3163eebff4720c9952059613e3ed0e8ee1b
MD5 hash:
4860a0239c1370480d249d28cdc071f3
SHA1 hash:
0e6e0c2f3a6f663e4ff3ae0ccf9a345cd02200d8
Link:
https://www.unpac.me/results/690b104a-4634-4816-9b7b-c011313aa18b/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/690b104a-4634-4816-9b7b-c011313aa18b/
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/39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2

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 39ec954d66b2484f72787a62cc472fc1c8cf95042c2dae1e045f972731ee51e2

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/75454/

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