MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c1a73f7739a7b955b899bafea374835c48757b50ac6743b0ff8be75c90748d70. 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: 14


Intelligence 14 IOCs YARA 8 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c1a73f7739a7b955b899bafea374835c48757b50ac6743b0ff8be75c90748d70
SHA3-384 hash: 2159109cccfcff3c1503f74c99ea7b7a6dacc1a5bf894374ace5c3ca069ea726f9b8e1ac1fac1345188b7375b98e5c9f
SHA1 hash: a75e402845ffb2a92ba55b67664bdf7cf9ab6eac
MD5 hash: e86fe5369ba1f0b416d6d6a3bd787ff4
humanhash: helium-july-cup-summer
File name:Client-built.exe
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:514'048 bytes
First seen:2022-09-09 18:53:51 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'597 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 6144:UTEgdc0YuXAGbgiIN2RSBYkDTPdXR4gaJXVErOjcEX9b8F9SkQz7yAcTR3C:UTEgdfYsbg5PUbHCA57yAcdC
Threatray 2'089 similar samples on MalwareBazaar
TLSH T1AAB46B4027FC8A1BE2AE57BAE87154205BF4F417B267EB8F4548B1ED2CA67029D40773
TrID 53.9% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
12.2% (.EXE) Microsoft Visual C++ compiled executable (generic) (16529/12/5)
9.6% (.SCR) Windows screen saver (13101/52/3)
7.7% (.EXE) Win64 Executable (generic) (10523/12/4)
4.8% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
Reporter Anonymous
Tags:exe QuasarRAT RAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
425
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
quasar
Create hunting rule
ID:
1
File name:
Client-built.exe
Verdict:
Malicious activity
Analysis date:
2022-09-09 18:54:13 UTC
Tags:
quasar
Link:
https://app.any.run/tasks/944e9935-c49f-460a-93e3-644ced750d19

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/309031/
Detection(s):
Win.Malware.Bulz-9823462-0
Create hunting rule

Win.Malware.Generic-9883082-0
Create hunting rule

Win.Malware.Generic-9883083-0
Create hunting rule

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

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

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Launching a process
Сreating synchronization primitives
Creating a file in the Program Files subdirectories
Sending a custom TCP request
Enabling autorun by creating a file
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-vm keylogger packed quasarrat rat shell32.dll stealer vermin
Link:
https://www.filescan.io/uploads/631b8c6255480bd187d8eac5/reports/c152d60b-61ca-4a07-839f-c8ba07765247/overview
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.
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/d402f1e9-a305-4712-9b3e-39a706aeec46
Result
Threat name:
AsyncRAT, Quasar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1067957
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Installs a global keyboard hook
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AsyncRAT
Yara detected Generic Downloader
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 700489 Sample: Client-built.exe Startdate: 09/09/2022 Architecture: WINDOWS Score: 100 29 Malicious sample detected (through community Yara rule) 2->29 31 Antivirus detection for dropped file 2->31 33 Antivirus / Scanner detection for submitted sample 2->33 35 8 other signatures 2->35 8 Client-built.exe 5 2->8         started        12 Client-built.exe 2 2->12         started        process3 file4 25 C:\Program Files\prg45\Javart.exe, PE32 8->25 dropped 27 C:\Users\user\...\Client-built.exe.log, ASCII 8->27 dropped 37 Uses schtasks.exe or at.exe to add and modify task schedules 8->37 39 Hides that the sample has been downloaded from the Internet (zone.identifier) 8->39 14 Javart.exe 2 8->14         started        17 schtasks.exe 1 8->17         started        signatures5 process6 signatures7 41 Hides that the sample has been downloaded from the Internet (zone.identifier) 14->41 43 Installs a global keyboard hook 14->43 19 schtasks.exe 1 14->19         started        21 conhost.exe 17->21         started        process8 process9 23 conhost.exe 19->23         started       
Detection:
quasar
Create hunting rule
Link:
https://mwdb.cert.pl/sample/c1a73f7739a7b955b899bafea374835c48757b50ac6743b0ff8be75c90748d70/
Threat name:
ByteCode-MSIL.Trojan.Quasar
Create hunting rule
Status:
Malicious
First seen:
2022-09-09 18:54:09 UTC
File Type:
PE (.Net Exe)
Extracted files:
2
AV detection:
22 of 26 (84.62%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ygtt65zzu64vloezxl7kg5edlrehk62qvrtuhmh7rptvzedurvya._file
Verdict:
malicious
Similar samples:
15a42865e3b9563b0162987d9ba85a18fe6f7befb28d39daed3277434347200f
QuasarRAT
2a530c0ce9e28ccef15ab536554c6e1174f33564d823e1cfcdb720c9771bb1cd
QuasarRAT
54b4c294aa0af37842024f57ba18af262f84859ff35c15a8a6595749f23c9524
QuasarRAT
b72b56dbce5ed9e23036bc98d439f81d9768c49952297e44029bcd6607407616
QuasarRAT
da62dc7807475728bb6136b887b01f080eb277b575b6f95f70bb14e01d28c714
QuasarRAT
e3b41c65b9ee28473b4487dc2879f7a2fe3ce33b52c1e4d351150a2f711c7026
QuasarRAT
+ 2'079 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/220909-xj7ngacfdm/
Behaviour
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Drops file in Program Files directory
Looks up external IP address via web service
Executes dropped EXE
Quasar RAT
Quasar payload
Malware Config
C2 Extraction:
70.70.19.220:4782
70.70.19.220:4753
Unpacked files
SH256 hash:
c1a73f7739a7b955b899bafea374835c48757b50ac6743b0ff8be75c90748d70
MD5 hash:
e86fe5369ba1f0b416d6d6a3bd787ff4
SHA1 hash:
a75e402845ffb2a92ba55b67664bdf7cf9ab6eac
Link:
https://www.unpac.me/results/6de81dc5-0b1e-4324-b83a-58c9f2353c51/
Malware family:
QuasarRAT
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/c1a73f7739a7/report/overview.html
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/c1a73f7739a7b955b899bafea374835c48757b50ac6743b0ff8be75c90748d70

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: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 artifcats 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
Author:Florian Roth
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:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Vermin_Keylogger_Jan18_1
Create hunting rule
Author:Florian Roth
Description:Detects Vermin Keylogger
Reference:https://researchcenter.paloaltonetworks.com/2018/01/unit42-vermin-quasar-rat-custom-malware-used-ukraine/

File information

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

Web download

QuasarRAT

Executable exe c1a73f7739a7b955b899bafea374835c48757b50ac6743b0ff8be75c90748d70

(this sample)

Cape
Cape
https://www.capesandbox.com/analysis/309031/
  
URLhaus
https://urlhaus.abuse.ch/url/2298423/
  
Delivery method
Distributed via web download

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