MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f6c77ac1c427fe9092c007b67b41402a471bd7726ce84e5978fdc953d08c9b0d. 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


AgentTesla


Vendor detections: 13


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

SHA256 hash: f6c77ac1c427fe9092c007b67b41402a471bd7726ce84e5978fdc953d08c9b0d
SHA3-384 hash: 3edfad0df7ab50c094918e3914d3b963c1453c5ffd37bc18b9cf7ca33e7ef6a64abc425188b77d76d67d35494f27be85
SHA1 hash: 5ea0260030deaf088fc4690e170aeac09dcedbf3
MD5 hash: aa2ca798ad773515fa4147777032f081
humanhash: april-princess-jig-stream
File name:rks18.doc
Download: download sample
Signature AgentTesla
Create hunting rule
File size:328'682 bytes
First seen:2024-04-18 10:06:35 UTC
Last seen:2024-04-18 10:44:16 UTC
File type:Word file doc
MIME type:text/rtf
ssdeep 3072:asXvKMEesXvKMEesXvKMEesXvKMEesXvKMEesXvKMEsluyI0WDGXCPL:vKMeKMeKMeKMeKMeKMHAyI0WaXCPL
TLSH T16564362ED34E02698F520273AB1B1E95A6BDBB3EB3905171342C433933D9C7D52266BD
TrID 71.4% (.PZ2) Poser pose (12500/1/4)
28.5% (.RTF) Rich Text Format (5000/1)
Reporter abuse_ch
Tags:AgentTesla CVE-2017-11882 doc

Intelligence

File Origin
# of uploads :
2
# of downloads :
482
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
f6c77ac1c427fe9092c007b67b41402a471bd7726ce84e5978fdc953d08c9b0d.doc
Verdict:
No threats detected
Analysis date:
2024-04-18 10:39:37 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/1213e5c5-2d4a-45a5-92ce-6c72fed17929

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Result
Verdict:
Malware
Maliciousness:

Behaviour
DNS request
Creating a window
Launching a service
Сreating synchronization primitives
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Creating a file in the %temp% directory
Creating a process with a hidden window
Creating a file
Searching for the window
Launching a process
Using the Windows Management Instrumentation requests
Launching a file downloaded from the Internet
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Enabling autorun by creating a file
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
Fake RTF File
Link:
https://app.docguard.net/f6c77ac1c427fe9092c007b67b41402a471bd7726ce84e5978fdc953d08c9b0d/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Link:
https://www.filescan.io/uploads/6620f0d6c5dabc22b2020967/reports/985e232d-1cd8-443b-a417-d2db4a3288fc/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/f6c77ac1c427fe9092c007b67b41402a471bd7726ce84e5978fdc953d08c9b0d
Label:
Malicious
Suspicious Score:
10/10
Score Malicious:
1%
Score Benign:
0%
Link:
https://www.malware.ai/gui/files/?id=8fc1b870-8b8b-46da-b18a-021d212206d6
Result
Verdict:
MALICIOUS
Result
Threat name:
AgentTesla
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1428010
Signature
.NET source code contains potential unpacker
.NET source code contains very large array initializations
Adds a directory exclusion to Windows Defender
Check if machine is in data center or colocation facility
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
Contains functionality to log keystrokes (.Net Source)
Document exploit detected (process start blacklist hit)
Drops PE files with a suspicious file extension
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
Installs new ROOT certificates
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office equation editor drops PE file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Sigma detected: Equation Editor Network Connection
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Scheduled temp file as task from temp location
Sigma detected: Suspicious Microsoft Office Child Process
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal ftp login credentials
Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AgentTesla
Yara detected Generic Downloader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1428010 Sample: rks18.doc Startdate: 18/04/2024 Architecture: WINDOWS Score: 100 66 Found malware configuration 2->66 68 Malicious sample detected (through community Yara rule) 2->68 70 Multi AV Scanner detection for dropped file 2->70 72 17 other signatures 2->72 8 WINWORD.EXE 336 14 2->8         started        10 taskeng.exe 2->10         started        process3 process4 12 EQNEDT32.EXE 11 8->12         started        17 EQNEDT32.EXE 8->17         started        19 aZgXsPaFEEEaTh.exe 10->19         started        dnsIp5 64 covid19help.top 104.21.83.128, 443, 49163 CLOUDFLARENETUS United States 12->64 48 C:\Users\user\AppData\...\loudjjohohj75.scr, PE32 12->48 dropped 50 C:\Users\user\...\MmxW3NwsZw7f1zs[1].scr, PE32 12->50 dropped 98 Installs new ROOT certificates 12->98 100 Office equation editor establishes network connection 12->100 102 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 12->102 21 loudjjohohj75.scr 1 10 12->21         started        104 Multi AV Scanner detection for dropped file 19->104 106 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 19->106 108 Machine Learning detection for dropped file 19->108 110 2 other signatures 19->110 25 aZgXsPaFEEEaTh.exe 19->25         started        28 powershell.exe 19->28         started        30 powershell.exe 19->30         started        32 schtasks.exe 19->32         started        file6 signatures7 process8 dnsIp9 44 C:\Users\user\AppData\...\aZgXsPaFEEEaTh.exe, PE32 21->44 dropped 46 C:\Users\user\AppData\Local\...\tmp9464.tmp, XML 21->46 dropped 82 Multi AV Scanner detection for dropped file 21->82 84 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 21->84 86 Machine Learning detection for dropped file 21->86 94 5 other signatures 21->94 34 loudjjohohj75.scr 21->34         started        38 powershell.exe 4 21->38         started        40 powershell.exe 4 21->40         started        42 schtasks.exe 21->42         started        58 smtp.gfs-ld.com 25->58 60 208.91.198.143, 587 PUBLIC-DOMAIN-REGISTRYUS United States 25->60 62 5 other IPs or domains 25->62 88 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 25->88 90 Tries to steal Mail credentials (via file / registry access) 25->90 92 Tries to harvest and steal ftp login credentials 25->92 96 2 other signatures 25->96 file10 signatures11 process12 dnsIp13 52 smtp.gfs-ld.com 34->52 54 ip-api.com 208.95.112.1, 49164, 49167, 80 TUT-ASUS United States 34->54 56 us2.smtp.mailhostbox.com 208.91.199.225, 587 PUBLIC-DOMAIN-REGISTRYUS United States 34->56 74 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 34->74 76 Tries to steal Mail credentials (via file / registry access) 34->76 78 Installs a global keyboard hook 34->78 80 Installs new ROOT certificates 38->80 signatures14
Score:
83%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/f6c77ac1c427fe9092c007b67b41402a471bd7726ce84e5978fdc953d08c9b0d
Detection:
cve-2017-11882-shellcode
Create hunting rule
Link:
https://mwdb.cert.pl/sample/f6c77ac1c427fe9092c007b67b41402a471bd7726ce84e5978fdc953d08c9b0d/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2024-04-18 02:52:52 UTC
File Type:
Document
Extracted files:
3
AV detection:
16 of 24 (66.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=63dxvqoee77jbewaa63hwqkafjdrxv3sntue4wly7xevhuemtmgq._file
Result
Malware family:
agenttesla
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla keylogger spyware stealer trojan
Link:
https://tria.ge/reports/240418-l5nlyahh73/
Behaviour
Checks processor information in registry
Creates scheduled task(s)
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of SetThreadContext
Looks up external IP address via web service
Executes dropped EXE
Loads dropped DLL
Reads WinSCP keys stored on the system
Reads data files stored by FTP clients
Reads user/profile data of local email clients
Reads user/profile data of web browsers
Blocklisted process makes network request
Downloads MZ/PE file
AgentTesla
Malware family:
AgentTesla
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/f6c77ac1c427/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.

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_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.
Rule name:SUSP_INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embedding one of the object mostly observed in exploit (e.g. CVE-2017-11882) documents.
Reference:https://github.com/ditekshen/detection

File information

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

Comments