MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 9a1f354adc72271651ddedebb43da24978c94c12e379413a09cea636c225e89c. 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: 13


Intelligence 13 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 9a1f354adc72271651ddedebb43da24978c94c12e379413a09cea636c225e89c
SHA3-384 hash: f2db1c8df369a9e57cb82a3f0baf4919ba0e6ef54a5bf6215d432f55d0ab8354d1886e1dc43d8084b03cd03fec4b3099
SHA1 hash: cb11dc0b37b657e53da520a6a2c57bad3b15509d
MD5 hash: 840605c897b5065f7fdc2a495f93eac2
humanhash: ink-uranus-autumn-shade
File name:verybig.exe
Download: download sample
Signature Tofsee
Create hunting rule
File size:13'817'344 bytes
First seen:2022-02-20 07:11:01 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 0baf64ed321a1a23b14ca49e0eb2e503 (1 x Tofsee)
ssdeep 49152:iBDqfowPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwPwT:iBm
Threatray 219 similar samples on MalwareBazaar
TLSH T149D62A12862185E5D27651FEBF7E3B8C97EFF622452ACCB709058EDAC4632460ECD50B
File icon (PE):PE icon
dhash icon 796ce6d3ccec7083 (1 x Tofsee)
Reporter adm1n_usa32
Tags:exe Tofsee

Intelligence

File Origin
# of uploads :
1
# of downloads :
627
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
verybig.exe
Verdict:
Malicious activity
Analysis date:
2022-02-20 07:08:22 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/4b4cb1c4-6822-4dc2-a87c-dd780668c19e

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Win.Dropper.Tofsee-7158504-1
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Sending a custom TCP request
Creating a file in the %temp% directory
Сreating synchronization primitives
Running batch commands
Creating a process with a hidden window
Launching a process
Creating a file
Launching the process to change the firewall settings
Creating a process from a recently created file
Creating a service
Launching a service
Launching the default Windows debugger (dwwin.exe)
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Enabling autorun for a service
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
control.exe gandcrab greyware tofsee
Link:
https://www.filescan.io/uploads/6211e989ac8ad0468b5a2d66/reports/473f9565-6f8f-4123-9b19-e1e8e8cadbcc/overview
Result
Verdict:
MALICIOUS
Malware family:
Tofsee
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/0f10d688-3843-42ba-8a95-87b6c6602cff
Result
Threat name:
Tofsee
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/942759
Signature
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Changes security center settings (notifications, updates, antivirus, firewall)
Deletes itself after installation
Detected unpacking (changes PE section rights)
Detected unpacking (overwrites its own PE header)
Drops executables to the windows directory (C:\Windows) and starts them
Found malware configuration
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Modifies the windows firewall
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
PE file has a writeable .text section
Sigma detected: Copying Sensitive Files with Credential Data
Sigma detected: Suspect Svchost Activity
Sigma detected: Suspicious Svchost Process
System process connects to network (likely due to code injection or exploit)
Uses netsh to modify the Windows network and firewall settings
Writes to foreign memory regions
Yara detected Tofsee
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 575237 Sample: verybig.exe Startdate: 20/02/2022 Architecture: WINDOWS Score: 100 54 microsoft-com.mail.protection.outlook.com 2->54 60 Multi AV Scanner detection for domain / URL 2->60 62 Found malware configuration 2->62 64 Malicious sample detected (through community Yara rule) 2->64 66 14 other signatures 2->66 8 kjzvcyd.exe 2->8         started        11 verybig.exe 2 2->11         started        14 svchost.exe 2->14         started        16 10 other processes 2->16 signatures3 process4 dnsIp5 72 Detected unpacking (changes PE section rights) 8->72 74 Detected unpacking (overwrites its own PE header) 8->74 76 Writes to foreign memory regions 8->76 84 2 other signatures 8->84 19 svchost.exe 1 8->19         started        50 C:\Users\user\AppData\Local\...\kjzvcyd.exe, PE32 11->50 dropped 78 Uses netsh to modify the Windows network and firewall settings 11->78 80 Modifies the windows firewall 11->80 23 cmd.exe 1 11->23         started        26 netsh.exe 3 11->26         started        28 cmd.exe 2 11->28         started        32 3 other processes 11->32 82 Changes security center settings (notifications, updates, antivirus, firewall) 14->82 30 MpCmdRun.exe 1 14->30         started        52 192.168.2.1 unknown unknown 16->52 file6 signatures7 process8 dnsIp9 56 43.231.4.7, 443, 49749, 49786 GIGABIT-MYGigabitHostingSdnBhdMY Malaysia 19->56 58 microsoft-com.mail.protection.outlook.com 104.47.54.36, 25, 49748 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 19->58 68 System process connects to network (likely due to code injection or exploit) 19->68 70 Deletes itself after installation 19->70 48 C:\Windows\SysWOW64\...\kjzvcyd.exe (copy), PE32 23->48 dropped 34 conhost.exe 23->34         started        36 conhost.exe 26->36         started        38 conhost.exe 28->38         started        40 conhost.exe 30->40         started        42 conhost.exe 32->42         started        44 conhost.exe 32->44         started        46 conhost.exe 32->46         started        file10 signatures11 process12
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/9a1f354adc72271651ddedebb43da24978c94c12e379413a09cea636c225e89c/
Threat name:
Win32.Trojan.BrsecmonE
Create hunting rule
Status:
Malicious
First seen:
2022-02-14 15:04:00 UTC
File Type:
PE (Exe)
Extracted files:
6
AV detection:
25 of 28 (89.29%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=tiptksw4oitrmuo55xv3ipncjf4mstas4n4ucoqjz2tdnqrf5coa._file
Verdict:
malicious
Similar samples:
0c3080ef33448167fc2b858db5ec7b2e4705cb12ca57119088892459ea0cc832
Tofsee
1246f985decb86014d2654d4debbf8f52f945a748b66d0a637494600b9bd2710
Tofsee
17831d6b96a1d60752b7031cf6307eb2ce6db23204991b7c6411f50f0ee99621
Tofsee
587f79f301d6ca9ad6a02642cf6ebfbce12b3eaa524ecd67834ca1314447c4da
Tofsee
59c50a429ba27538378b98c12fc53f34883c9a10c01329d07c3a56de11f09e46
Tofsee
8d64110a77ed9fe2d9454816668d95ed000442a34bb558ca0447ebd8c08b30ba
Tofsee
8fcb2057bdac3ba88cb811c44a0d79358075525506b1517c3e713aec8d31a666
Tofsee
90ab735f3e99db675bbc2913b1f34ef7bd72636222ae8b2a2b5e4de01c2e2dea
Tofsee
af21217ee5523873bc4ee3b262ce06a371a1095abfea9729e3413cf9da1a0cab
Tofsee
f5c60cf3334fc3093cb2b7b6bcfa480bf87a74b4edd8830b97c1ee3b3e66cefd
Tofsee
+ 209 additional samples on MalwareBazaar
Result
Malware family:
tofsee
Create hunting rule
Score:
  10/10
Tags:
family:tofsee evasion persistence trojan
Link:
https://tria.ge/reports/220220-hzym6shhf7/
Behaviour
Checks processor information in registry
Modifies data under HKEY_USERS
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Drops file in Windows directory
Launches sc.exe
Suspicious use of SetThreadContext
Checks computer location settings
Deletes itself
Creates new service(s)
Executes dropped EXE
Modifies Windows Firewall
Sets service image path in registry
Tofsee
Windows security bypass
Malware Config
C2 Extraction:
43.231.4.7
lazystax.ru
Unpacked files
SH256 hash:
3ba0e9c954c88eb0db4a981b2822227fee8657e2f70e0d475ee43f7f37bd04e5
MD5 hash:
597dd951d3fbe2706d5f42c8b74ce11a
SHA1 hash:
dbc70ffbfc2d5746e293e4e27aaa37d60f0f07d4
Detections:
win_tofsee_w0
Create hunting rule
Link:
https://www.unpac.me/results/0ab3c3ff-788d-427d-acfc-747cb270e9e9/
SH256 hash:
9a1f354adc72271651ddedebb43da24978c94c12e379413a09cea636c225e89c
MD5 hash:
840605c897b5065f7fdc2a495f93eac2
SHA1 hash:
cb11dc0b37b657e53da520a6a2c57bad3b15509d
Link:
https://www.unpac.me/results/0ab3c3ff-788d-427d-acfc-747cb270e9e9/
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/9a1f354adc72271651ddedebb43da24978c94c12e379413a09cea636c225e89c

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:MALWARE_Win_Tofsee
Create hunting rule
Author:ditekSHen
Description:Detects Tofsee
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.

Comments