MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87. 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: 7


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

SHA256 hash: 88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87
SHA3-384 hash: ca7117b5246f063f325ef5a52a044f0ae526ceffad03714b9d7b9f36d9315aaf6f071de76d4b996a5eda8fbef22b8f7b
SHA1 hash: 0a75d1cfd95172aa20d75a4fbc67952b8aca1ac2
MD5 hash: b01bcc20137e6cc6683881d70eef7815
humanhash: november-eighteen-seven-wolfram
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'314'041 bytes
First seen:2026-07-29 13:52:30 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (589 x Efimer, 60 x BlankGrabber, 23 x SalatStealer)
ssdeep 393216:6dzs3wbzzulfPvPZFmXMCHWUjXecuI3/PGTAI:6dYgbzz83vKXMb8XTH/O7
TLSH T138E6336C6BE012EBEAE7513CED932691D0B4B4671372CD9B1BE883A52E171D14E3D213
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 71f0e4d4e6e4f070 (4 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
144
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/d44ee43c-e479-4d62-bbf7-d2fa5933f7d3/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/76708/
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
Launching a service
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/6a6a0607962ac356c250ff35/reports/aaab0f33-04fe-4f9d-aaa0-b7389ce5e4b7/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87
Verdict:
Unknown
File Type:
PE
First seen:
2026-07-29T10:40:00Z UTC
Last seen:
2026-07-29T10:40:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/9739a27a-ba00-4ae3-8c6b-a02075ac8c4f
Gathering data
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87
Verdict:
inconclusive
YARA:
6 match(es)
Tags:
Executable PDB Path PE (Portable Executable) PE File Layout Win 64 Exe x64
Link:
https://app.malva.re/file/b01bcc20137e6cc6683881d70eef7815
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87/
Threat name:
Win64.Malware.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-29 13:58:34 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=rcuat7ipxt7angd5nq7mobghr4gfuhmdv3q45c2usvgwu2u5n6dq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260729-q6y7aaxva1/
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:
88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87
MD5 hash:
b01bcc20137e6cc6683881d70eef7815
SHA1 hash:
0a75d1cfd95172aa20d75a4fbc67952b8aca1ac2
Link:
https://www.unpac.me/results/b46b7728-014d-4f2b-ba5f-4631ba2046d1/
SH256 hash:
1c9c12648f2f29d9189bf232df340468a00a09e26ef517be6a2aebda84f4eeeb
MD5 hash:
f722ce8e35e70b5af26e8a22fd508b23
SHA1 hash:
30af4a572414660184c8c7b6e6dd91fb6f6bde17
Link:
https://www.unpac.me/results/b46b7728-014d-4f2b-ba5f-4631ba2046d1/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/b46b7728-014d-4f2b-ba5f-4631ba2046d1/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/b46b7728-014d-4f2b-ba5f-4631ba2046d1/
Please note that we are no longer able to provide a coverage score for Virus Total.

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 88a809fd0fbcfe06987d6c3ec704c78f0c5a1d83aee1ce8b54954d6a6a9d6f87

(this sample)

  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/3864471/
Cape
Cape
https://www.capesandbox.com/analysis/76708/

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