MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f. 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: 9


Intelligence 9 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f
SHA3-384 hash: b94de0b2f6fbd62b6ad570c93c28b95b9586480b2764a7496fd9d69c07e541ecae792aa4b5e4e2730dadd79894392fd4
SHA1 hash: 4dcc43df029bca0226f19eeae8cf9ec898cd020c
MD5 hash: 65476e966e189531f646f56d2a9f74b2
humanhash: nevada-yankee-solar-alaska
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'287'181 bytes
First seen:2026-07-26 17:52:29 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (547 x Efimer, 60 x BlankGrabber, 23 x SalatStealer)
ssdeep 393216:ywBnW9euv3ZsLa0RaooS5AUXMCHWUjXgcuI3/PGTAI:yBv3ZsnR35AUXMb8X1H/O7
TLSH T1D3E6331C66E002FEDE77923CBDE29581E566B8A50B31C9DB075883E26F271D1193EB43
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 5471f0e8e8e0f030 (11 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
157
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/9b6d9bff-3291-49ab-8cdc-54b2797e1a08/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/76306/
Detection(s):
SecuriteInfo.com.Variant.Dropper.354.UNOFFICIAL
Create hunting rule

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/6a6649c4fd0217ad521894be/reports/b0febfd8-4612-4a99-adce-9419e15efc41/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-26T15:53:00Z UTC
Last seen:
2026-07-26T16:32:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/d3046130-4309-4236-ab91-e011653c9e27
Gathering data
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f
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/65476e966e189531f646f56d2a9f74b2
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f/
Threat name:
Win64.Malware.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-26 17:57:49 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
9 of 36 (25.00%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=msrylmv7v3zismmjbdv7gyo75kwdosexou5ly6muytqeqeqonchq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260726-wf7zdscj5w/
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:
64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f
MD5 hash:
65476e966e189531f646f56d2a9f74b2
SHA1 hash:
4dcc43df029bca0226f19eeae8cf9ec898cd020c
Link:
https://www.unpac.me/results/5aa087fd-f367-480f-be5f-857a0247c1a5/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/5aa087fd-f367-480f-be5f-857a0247c1a5/
SH256 hash:
785fa7b65671cd8a8d8d6ee0d0a7b48b88daa5e1a7c34cb2e6af9813264bfc5e
MD5 hash:
22c420b7824b8842cced0be16789efc9
SHA1 hash:
2ec6dece4e06e3fa5b9a8856bca72876fbfc032e
Link:
https://www.unpac.me/results/5aa087fd-f367-480f-be5f-857a0247c1a5/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/5aa087fd-f367-480f-be5f-857a0247c1a5/
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/64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f

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 64a385b2bfaef289318908ebf361dfeaac374897753abc7994c4e048120e688f

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/76306/
  
URLhaus
https://urlhaus.abuse.ch/url/3864471/

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