MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d. 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: 8


Intelligence 8 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d
SHA3-384 hash: 2b556ecd4e862b518200f3d172ec70928a938b16787669de39e9bb233aa616d7c093808c23e6814e80456ceaf4bd3aba
SHA1 hash: 3503c9af8fa80df84fb7c793d7afa020ea20790f
MD5 hash: f05dc2cdcc68a1a80cea2236bef76642
humanhash: helium-equal-gee-missouri
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'280'312 bytes
First seen:2026-07-26 10:52:30 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (535 x Efimer, 60 x BlankGrabber, 23 x SalatStealer)
ssdeep 393216:OZ4dOZ+OsUz8rllzXMCHWUjX9cuI3/PGTAI:OgHsArlhXMb8XKH/O7
TLSH T1E5E63308FAE011E9EA739038AED161C6D5B5B875ABB1D1DB533897E39E132D0C43DA43
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 5471d4d8c8e4f030 (7 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
154
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/c793ecfa-9733-4bc2-9883-0a966b4095ce/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/76239/
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/6a65e6fbf4ea796beec80fae/reports/63ea4088-ae0c-4dd5-89a0-17df501dad16/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/0694b217-7c63-4b84-b8fd-15969d118fa4
Gathering data
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d
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/f05dc2cdcc68a1a80cea2236bef76642
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d/
Threat name:
Win64.Malware.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-26 10:53:39 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=7vjnb6snkl7driozyzf5scavoepd4unw4fk3zhjs6q4hzdsdzqgq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260726-myq9xss1cv/
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:
fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d
MD5 hash:
f05dc2cdcc68a1a80cea2236bef76642
SHA1 hash:
3503c9af8fa80df84fb7c793d7afa020ea20790f
Link:
https://www.unpac.me/results/7a909b0a-81ac-4821-9fec-87ea214aa907/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/7a909b0a-81ac-4821-9fec-87ea214aa907/
SH256 hash:
6ecacc867b5c24964a3ecfbddc86e7cde8a6cdb4f8bccdc80bdb8084d4e2463e
MD5 hash:
56013863bff81c64d42b0ea45915b63c
SHA1 hash:
40c232ff98cfab0ebe0b7978756a0d4fe67d5a12
Link:
https://www.unpac.me/results/7a909b0a-81ac-4821-9fec-87ea214aa907/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/7a909b0a-81ac-4821-9fec-87ea214aa907/
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/fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d

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 fd52d0fa4d52fe38a1d9c64bd90815711e3e51b6e155bc9d32f4387c8e43cc0d

(this sample)

  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/76239/

Comments