MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0. 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


Tofsee


Vendor detections: 15


Intelligence 15 IOCs YARA 26 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0
SHA3-384 hash: adf53927b4a965b9ca9319e0fac9a2bc35a5417a0f276f8db5edbd8aac35e7149e016e1c5af1f08646eb4cba8faed1c6
SHA1 hash: c8579f878580f2e0bca855b45aa371abf871b9a2
MD5 hash: 773647e840480738ae8b751f32df05b6
humanhash: hot-hotel-august-maine
File name:file
Download: download sample
Signature Tofsee
Create hunting rule
File size:3'463'697 bytes
First seen:2025-11-27 13:43:19 UTC
Last seen:2025-11-30 20:30:53 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash ac4ded70f85ef621e5f8917b250855be (25 x OffLoader, 2 x Tofsee, 2 x CHStealer)
ssdeep 49152:jN61T1muh7Iodz4gOXrB229JqGhfktMYnkbb4mZyPOT4Az4aNH0/1Qcgn8UGiNDc:jN66KIFc2zCrn4br0PitNsm8R+Nu
TLSH T152F5F133B389673EE06E0A375AF2D2105C3B6661651B8C47A7E44C4CCF6A2601E7F697
TrID 62.3% (.EXE) Inno Setup installer (107240/4/30)
24.1% (.EXE) Win32 EXE PECompact compressed (generic) (41569/9/9)
6.1% (.EXE) Win64 Executable (generic) (10522/11/4)
2.6% (.EXE) Win32 Executable (generic) (4504/4/1)
1.2% (.EXE) Win16/32 Executable Delphi generic (2072/23)
Magika pebin
Reporter Bitsight
Tags:D dropped-by-gcleaner EUNIQ.file exe Tofsee


Avatar
Bitsight
url: http://194.38.20.224/service

Intelligence

File Origin
# of uploads :
34
# of downloads :
115
Origin country :
US US
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
file
Verdict:
Suspicious activity
Analysis date:
2025-11-27 13:46:37 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/e7fc8360-2738-4c19-9aca-7b3c1f080b0a

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Tofsee
Create hunting rule
Link:
https://www.capesandbox.com/analysis/41648/
Detection(s):
Win.Malware.Generic-10058577-0
Create hunting rule

Verdict:
Clean
Score:
70%
Link:
https://cyber-fortress.com/docs/result/index.php?id=692855ac6cb1dcd577818ced
Tags:
n/a
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% subdirectories
Creating a window
Creating a process from a recently created file
Сreating synchronization primitives
Searching for synchronization primitives
Restart of the analyzed sample
Creating a process with a hidden window
Sending a custom TCP request
Creating a file
Moving a recently created file
Enabling the 'hidden' option for recently created files
DNS request
Connection attempt
Connecting to a non-recommended domain
Launching a process
Enabling autorun by creating a file
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
adaptive-context embarcadero_delphi fingerprint inno installer installer installer-heuristic overlay packed
Link:
https://www.filescan.io/uploads/692855abab9dcca0c6fb4cae/reports/b134d980-e290-44ec-a369-9d039bd6bf1f/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_70%
Link:
https://www.hybrid-analysis.com/sample/ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-11-27T10:41:00Z UTC
Last seen:
2025-11-29T06:48:00Z UTC
Hits:
~100
Detections:
Trojan.Win32.RokRat.sb Trojan.Win32.Gatak.sb Backdoor.Remcos.TCP.C&C Trojan.Win32.Mansabo.sb Trojan.Win32.AntiAV.sb Backdoor.Win32.Tofsee.sb Backdoor.Tofsee.TCP.C&C Trojan.Win32.Shellcode.sb not-a-virus:RiskTool.Win32.BitCoinMiner.sb Backdoor.Win32.Tofsee.efob
Link:
https://opentip.kaspersky.com/ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/808c16c7-3e1c-49cd-bc26-2026c23bdde1
Score:
82%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0
Verdict:
inconclusive
YARA:
4 match(es)
Tags:
Executable PE (Portable Executable) PE File Layout Win 32 Exe x86
Link:
https://app.malva.re/file/773647e840480738ae8b751f32df05b6
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0/
Verdict:
Malicious
Threat:
Family.TOFSEE
Link:
https://tip.neiki.dev/file/ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0
Threat name:
Win32.Backdoor.Tofsee
Create hunting rule
Status:
Suspicious
First seen:
2025-11-27 13:44:15 UTC
File Type:
PE (Exe)
AV detection:
10 of 24 (41.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=vsi6lfctun3zltmck6wmzurh2ipwr4q2aam7y53f4cr5vi6k6tqa._file
Result
Malware family:
tofsee
Create hunting rule
Score:
  10/10
Tags:
family:tofsee discovery installer trojan
Link:
https://tria.ge/reports/251127-q1wh7szrhr/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of FindShellTrayWindow
Suspicious use of WriteProcessMemory
Inno Setup is an open-source installation builder for Windows applications.
Enumerates physical storage devices
System Location Discovery: System Language Discovery
ACProtect 1.3x - 1.4x DLL software
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Tofsee
Tofsee family
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/1ed4fb70-ba2e-49a9-88b1-e56db24dbf22
Unpacked files
SH256 hash:
ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0
MD5 hash:
773647e840480738ae8b751f32df05b6
SHA1 hash:
c8579f878580f2e0bca855b45aa371abf871b9a2
Link:
https://www.unpac.me/results/aa9ad512-413b-4772-8d0d-7785ef3a0ef5/
SH256 hash:
6ecd31edd947b65eb241e146214a0962ed8a774e7ed72b59b4414650d9865ff9
MD5 hash:
465d666c4dfc804a8a323e8d5c7e78a4
SHA1 hash:
68885db0c3e446bc0f280fc0b315dcabab3009aa
Link:
https://www.unpac.me/results/aa9ad512-413b-4772-8d0d-7785ef3a0ef5/
SH256 hash:
388a796580234efc95f3b1c70ad4cb44bfddc7ba0f9203bf4902b9929b136f95
MD5 hash:
e4211d6d009757c078a9fac7ff4f03d4
SHA1 hash:
019cd56ba687d39d12d4b13991c9a42ea6ba03da
Link:
https://www.unpac.me/results/aa9ad512-413b-4772-8d0d-7785ef3a0ef5/
Malware family:
Tofsee
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/ac91e59453a3/report/overview.html
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/ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0

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:Borland
Create hunting rule
Author:malware-lu
Rule name:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Thread
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Detect_Tofsee
Create hunting rule
Author:@malgamy12
Description:Detect_Tofsee
Rule name:dgaagas
Create hunting rule
Author:Harshit
Description:Uses certutil.exe to download a file named test.txt
Rule name:FreddyBearDropper
Create hunting rule
Author:Dwarozh Hoshiar
Description:Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip.
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:MALWARE_Win_Grum
Create hunting rule
Author:ditekSHen
Description:Detect Grum spam bot
Rule name:MALWARE_Win_Tofsee
Create hunting rule
Author:ditekSHen
Description:Detects Tofsee
Rule name:MAL_packer_lb_was_detected
Create hunting rule
Author:0x0d4y
Description:Detect the packer used by Lockbit4.0
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:ProgramLanguage_Rust
Create hunting rule
Author:albertzsigovits
Description:Application written in Rust programming language
Rule name:SEH__vectored
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:SHA512_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA384/SHA512 constants
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns
Rule name:ThreadControl__Context
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Windows_Generic_Threat_c9003b7b
Create hunting rule
Author:Elastic Security
Rule name:Windows_Trojan_Tofsee_26124fe4
Create hunting rule
Author:Elastic Security
Rule name:win_tofsee_bot
Create hunting rule
Author:akrasuski1
Description:Tofsee malware
Rule name:win_tofsee_w0
Create hunting rule
Author:akrasuski1

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

Tofsee

Executable exe ac91e59453a37795cd8257acccd227d21f68f21a0019fc7765e0a3daa3caf4e0

(this sample)

  
Dropped by
Gcleaner
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/41648/

Comments