MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba. 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


QuasarRAT


Vendor detections: 16


Intelligence 16 IOCs YARA 22 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba
SHA3-384 hash: 17f502248e80fac1a43526fa3bc2371f6eeb89a35ed786421c13bd01e7b124faba0cc232922bec48e3b7b2e99827995c
SHA1 hash: b0f5340184e1224a37a36a8cdc7bc0d0cbe07395
MD5 hash: 8ab4c5f5caede18056fc1c0574d3217c
humanhash: lactose-seventeen-saturn-delta
File name:Client-built.exe
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:3'266'048 bytes
First seen:2024-07-20 05:44:52 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep 49152:KvbI22SsaNYfdPBldt698dBcjHmeDkE2HFk/+FboGdjITHHB72eh2NT:Kvk22SsaNYfdPBldt6+dBcjHmeDaR
Threatray 721 similar samples on MalwareBazaar
TLSH T16DE55B143BF85F23E1BBE27395B0041667F0EC2AB3A3EB1B5191677E1C53B4059426AB
TrID 37.4% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
29.5% (.CPL) Windows Control Panel Item (generic) (57583/11/19)
8.4% (.EXE) Microsoft Visual C++ compiled executable (generic) (16529/12/5)
6.7% (.SCR) Windows screen saver (13097/50/3)
5.3% (.EXE) Win64 Executable (generic) (10523/12/4)
Reporter Chainskilabs
Tags:exe QuasarRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
354
Origin country :
US US
Vendor Threat Intelligence
Detection(s):
Win.Malware.Generic-9883083-0
Create hunting rule

Win.Malware.Msilheracles-9900242-0
Create hunting rule

ditekSHen.MALWARE.Win.Trojan.QuasarStealer.UNOFFICIAL
Create hunting rule

Win.Packed.Downeks-6898097-0
Create hunting rule

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=669b4ee02f6eaff4b90ef1fa
Tags:
Execution Generic Network Heur
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Сreating synchronization primitives
Creating a file in the %temp% directory
Running batch commands
Creating a process with a hidden window
Creating a file
Launching a process
Unauthorized injection to a recently created process
Restart of the analyzed sample
Verdict:
Malicious
Labled as:
Trojan.Agent
Link:
https://www.hybrid-analysis.com/sample/f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Malware family:
Quasar RAT
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/a2791ba9-2d1d-4d9c-accd-48553ef785d3
Result
Threat name:
Quasar
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1477158
Signature
AI detected suspicious sample
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Uses ping.exe to check the status of other devices and networks
Uses ping.exe to sleep
Yara detected Generic Downloader
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1477158 Sample: Client-built.exe Startdate: 20/07/2024 Architecture: WINDOWS Score: 100 87 Multi AV Scanner detection for domain / URL 2->87 89 Found malware configuration 2->89 91 Malicious sample detected (through community Yara rule) 2->91 93 9 other signatures 2->93 14 Client-built.exe 10 2->14         started        process3 file4 79 C:\Users\user\AppData\...\t5h1lmspmbXP.bat, DOS 14->79 dropped 81 C:\Users\user\...\Client-built.exe.log, CSV 14->81 dropped 111 Hides that the sample has been downloaded from the Internet (zone.identifier) 14->111 18 cmd.exe 1 14->18         started        signatures5 process6 signatures7 95 Uses ping.exe to sleep 18->95 97 Uses ping.exe to check the status of other devices and networks 18->97 21 Client-built.exe 9 18->21         started        25 conhost.exe 18->25         started        27 PING.EXE 1 18->27         started        29 chcp.com 1 18->29         started        process8 file9 75 C:\Users\user\AppData\...\CWkQ44214r4S.bat, DOS 21->75 dropped 101 Hides that the sample has been downloaded from the Internet (zone.identifier) 21->101 31 cmd.exe 1 21->31         started        signatures10 process11 signatures12 113 Uses ping.exe to sleep 31->113 34 Client-built.exe 9 31->34         started        38 conhost.exe 31->38         started        40 PING.EXE 1 31->40         started        42 chcp.com 1 31->42         started        process13 file14 73 C:\Users\user\AppData\...\nCjTRPKxgesS.bat, DOS 34->73 dropped 99 Hides that the sample has been downloaded from the Internet (zone.identifier) 34->99 44 cmd.exe 1 34->44         started        signatures15 process16 signatures17 107 Uses ping.exe to sleep 44->107 47 Client-built.exe 9 44->47         started        51 conhost.exe 44->51         started        53 PING.EXE 1 44->53         started        55 chcp.com 1 44->55         started        process18 file19 83 C:\Users\user\AppData\...\XpyUrWxcupfs.bat, DOS 47->83 dropped 85 Hides that the sample has been downloaded from the Internet (zone.identifier) 47->85 57 cmd.exe 47->57         started        signatures20 process21 signatures22 105 Uses ping.exe to sleep 57->105 60 Client-built.exe 57->60         started        64 conhost.exe 57->64         started        66 chcp.com 57->66         started        68 PING.EXE 57->68         started        process23 file24 77 C:\Users\user\AppData\...\6pRnPhfbErNe.bat, DOS 60->77 dropped 109 Hides that the sample has been downloaded from the Internet (zone.identifier) 60->109 70 cmd.exe 60->70         started        signatures25 process26 signatures27 103 Uses ping.exe to sleep 70->103
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba
Detection:
quasar
Create hunting rule
Link:
https://mwdb.cert.pl/sample/f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba/
Threat name:
ByteCode-MSIL.Backdoor.Quasar
Create hunting rule
Status:
Malicious
First seen:
2024-07-20 00:55:16 UTC
File Type:
PE (.Net Exe)
Extracted files:
2
AV detection:
31 of 38 (81.58%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=7gpmxwpsmbenxolc6fyrdgpf6xiavsf33b7vhhovvglddik7vw5a._file
Verdict:
malicious
Similar samples:
30c381a042e571d4d749f7aff6e1b17d77100ad35368c9a67136c1b5436c79cb
QuasarRAT
9409521653887ec13272edd26f3768efb6f176b49b15a058dfcf69b9172faece
QuasarRAT
ced760664a7c5580e324d99d695b119c1f3ec94d1d9c56d1d3882347f0c6eb10
QuasarRAT
f181b5a4e2f0dc0cdf70e16c18e3466e436aae0bb96ef9b7dc24c7f219167115
QuasarRAT
f72153dbb753423e630840ed3674c6a0ce27b4ff5d1790a5bbb6d5707f9ed41e
QuasarRAT
+ 711 additional samples on MalwareBazaar
Result
Malware family:
quasar
Create hunting rule
Score:
  10/10
Tags:
family:quasar botnet:office04 spyware trojan
Link:
https://tria.ge/reports/240720-gfqmsayenj/
Behaviour
Runs ping.exe
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Checks computer location settings
Quasar RAT
Quasar payload
Malware Config
C2 Extraction:
tr3.localto.net:6065
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/73b5b424-331d-4e02-a4ba-fa5e38651650
Unpacked files
SH256 hash:
f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba
MD5 hash:
8ab4c5f5caede18056fc1c0574d3217c
SHA1 hash:
b0f5340184e1224a37a36a8cdc7bc0d0cbe07395
Detections:
QuasarRAT
Create hunting rule
malware_windows_xrat_quasarrat
Create hunting rule
win_quasarrat_j2
Create hunting rule
cn_utf8_windows_terminal
Create hunting rule
MAL_QuasarRAT_May19_1
Create hunting rule
Link:
https://www.unpac.me/results/0f7dc472-5e91-4159-be2e-99e6202782a6/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
iSpy Keylogger
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba

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:BLOWFISH_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for Blowfish constants
Rule name:INDICATOR_SUSPICIOUS_Binary_References_Browsers
Create hunting rule
Author:ditekSHen
Description:Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
Rule name:INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
Create hunting rule
Author:ditekSHen
Description:Detects Windows executables referencing non-Windows User-Agents
Rule name:INDICATOR_SUSPICIOUS_GENInfoStealer
Create hunting rule
Author:ditekSHen
Description:Detects executables containing common artifacts observed in infostealers
Rule name:MALWARE_Win_QuasarStealer
Create hunting rule
Author:ditekshen
Description:Detects Quasar infostealer
Rule name:MAL_QuasarRAT_May19_1
Create hunting rule
Description:Detects QuasarRAT malware
Rule name:MAL_QuasarRAT_May19_1
Create hunting rule
Author:Florian Roth (Nextron Systems)
Description:Detects QuasarRAT malware
Reference:https://blog.ensilo.com/uncovering-new-activity-by-apt10
Rule name:MAL_QuasarRAT_May19_1_RID2E1E
Create hunting rule
Author:Florian Roth
Description:Detects QuasarRAT malware
Reference:https://blog.ensilo.com/uncovering-new-activity-by-apt10
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:Multifamily_RAT_Detection
Create hunting rule
Author:Lucas Acha (http://www.lukeacha.com)
Description:Generic Detection for multiple RAT families, PUPs, Packers and suspicious executables
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
Rule name:RC6_Constants
Create hunting rule
Author:chort (@chort0)
Description:Look for RC6 magic constants in binary
Reference:https://twitter.com/mikko/status/417620511397400576
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:SHA512_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA384/SHA512 constants
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Windows_Generic_Threat_803feff4
Create hunting rule
Author:Elastic Security
Rule name:win_quasar_rat_client
Create hunting rule
Author:Matthew @ Embee_Research
Description:Detects strings present in Quasar Rat Samples.

File information

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

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high

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