MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2. 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: 38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2
SHA3-384 hash: d01b20a15531d504842ab4e4e652a1bcf54e79cc6f5eaf30649717bc05f9d03c6afd2fe6502818e711d504f5e5b0fdda
SHA1 hash: 0ed0c0384f173c6bca24884b9f6714d881e8ad41
MD5 hash: 3006f98990508fe14cfa94aefeb18bda
humanhash: oregon-early-ack-sodium
File name:default.dat
Download: download sample
Signature Efimer
Create hunting rule
File size:14'294'095 bytes
First seen:2026-07-19 03:52:09 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash dcaf48c1f10b0efa0a4472200f3850ed (408 x Efimer, 60 x BlankGrabber, 22 x SalatStealer)
ssdeep 393216:wMRgaBv5z6wUdOJn9GXMCHWUjXkcuI3/PGTAI:w7IGOxAXMb8XxH/O7
TLSH T1C2E6334865E055FEE5938138E9B2D6E5F5A9B8B24B32CBDF0B5487992E130D08D3C173
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 f8f8f8f8f8f8e0e0 (2 x Efimer)
Reporter aachum
Tags:ClickFix Efimer exe


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

Intelligence

File Origin
# of uploads :
1
# of downloads :
162
Origin country :
ES ES
Vendor Threat Intelligence
Malware configuration found for:
PyInstaller
Details
Link:
https://research.acce.ciphertechsolutions.com/results/f737834d-e4a2-4dbb-816c-3b5c99685e7c/
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/75163/
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=6a5c49fa85479d70bfb76f4b
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/6a5c49f8566281eeb9e0fc23/reports/21424143-2e3b-463d-980b-1d688a3fa417/overview
Verdict:
Malicious
Labled as:
Yogi.Generic
Link:
https://www.hybrid-analysis.com/sample/38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-07-19T01:17:00Z UTC
Last seen:
2026-07-21T01:23:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/3bdcdbce-ddd3-4997-bf5d-a06880ff9519
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
72 / 100
Link:
https://www.joesandbox.com/analysis/1944706
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: 1944706 Sample: default.dat.exe Startdate: 19/07/2026 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:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2
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/3006f98990508fe14cfa94aefeb18bda
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2/
Threat name:
Win64.Trojan.Yogi
Create hunting rule
Status:
Malicious
First seen:
2026-07-19 03:53:57 UTC
File Type:
PE+ (Exe)
Extracted files:
482
AV detection:
8 of 24 (33.33%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=hbcsjcp5a4vkp7w5pi7gd2rx5uvud36kgc6frgzgr5ssltzqdhba._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution pyarmor pyinstaller
Link:
https://tria.ge/reports/260719-ee82madz7v/
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:
38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2
MD5 hash:
3006f98990508fe14cfa94aefeb18bda
SHA1 hash:
0ed0c0384f173c6bca24884b9f6714d881e8ad41
Link:
https://www.unpac.me/results/580b4807-70f7-4089-ae78-77c19d0fa90a/
SH256 hash:
36585912e5eaf83ba9fea0631534f690ccdc2d7ba91537166fe53e56c221e153
MD5 hash:
862f820c3251e4ca6fc0ac00e4092239
SHA1 hash:
ef96d84b253041b090c243594f90938e9a487a9a
Link:
https://www.unpac.me/results/580b4807-70f7-4089-ae78-77c19d0fa90a/
SH256 hash:
a5c6a329698490a035133433928d04368ce6285bb91a9d074fc285de4c9a32a4
MD5 hash:
16855ebef31c5b1ebe767f1c617645b3
SHA1 hash:
315521f3a748abfa35cd4d48e8dd09d0556d989b
Link:
https://www.unpac.me/results/580b4807-70f7-4089-ae78-77c19d0fa90a/
SH256 hash:
f72811d47e4a2dff7837d0664814054d318aa837f0ac9f10be9c27a95d9245f4
MD5 hash:
c41cb3e0ff6f799143f160f6ccde758a
SHA1 hash:
e93ea913921a195bbd369f733d5b75d9f2728a43
Link:
https://www.unpac.me/results/580b4807-70f7-4089-ae78-77c19d0fa90a/
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/38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2

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 38452489fd072aa7fedd7a3e61ea37ed2b41efca30bc589b268f6525cf3019c2

(this sample)

  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/3864471/
Cape
Cape
https://www.capesandbox.com/analysis/75163/

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