MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 6fa3a8b31b5aa450afc06a2a08149af42ef62ae7be55d93db25ec2c3e3edb93f. 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: 9


Intelligence 9 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 6fa3a8b31b5aa450afc06a2a08149af42ef62ae7be55d93db25ec2c3e3edb93f
SHA3-384 hash: 28a7bddf40e76509e73d0ec38fb3aab54d496067f4354ce955cc970a0d5bb43ef4d8b9e5922d0f55a16bb8c3242d01a9
SHA1 hash: d79f007accc610efe64c1bb7c153b9864b57df9c
MD5 hash: 44fc7a2a5ac9763da365699cee8b717a
humanhash: illinois-high-bravo-ink
File name:import_Doc_images.exe
Download: download sample
Signature AgentTesla
Create hunting rule
File size:406'528 bytes
First seen:2020-08-05 08:32:51 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'600 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 6144:0ecsta3cBJSaqIhrMPzPHbsJeSilyu9CFGd0J9jyADh6Tw8mwW:0e1ta389MU0Sikuk9OADgKD
Threatray 10'696 similar samples on MalwareBazaar
TLSH 1C84CF2806884227D4AD81BFDC6E61A617E1A533A41DF35B02A8D1FC39D73E3DB5630B
Reporter abuse_ch
Tags:AgentTesla exe


Avatar
abuse_ch
Malspam distributing AgentTesla:

HELO: server.example.com
Sending IP: 62.171.146.191
From: 佳益外销Dinah <admin@genogan.ga>
Subject: 回复: Importing documents
Attachment: import_Doc_images.rar (contains "import_Doc_images.exe")

AgentTesla SMTP exfil server:
smtp.office365.com:587

Intelligence

File Origin
# of uploads :
1
# of downloads :
63
Origin country :
n/a
Vendor Threat Intelligence
Detection:
Agenttesla
Create hunting rule
Link:
https://www.capesandbox.com/analysis/39218/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file
Sending a UDP request
Launching a process
Creating a window
Using the Windows Management Instrumentation requests
Creating a file in the %AppData% subdirectories
Enabling the 'hidden' option for recently created files
Reading critical registry keys
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Stealing user critical data
Enabling autorun by creating a file
Unauthorized injection to a system process
Result
Threat name:
AgentTesla
Create hunting rule
Detection:
malicious
Classification:
troj.adwa.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/410589
Signature
Drops PE files to the startup folder
Drops PE files to the user root directory
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Initial sample is a PE file and has a suspicious name
Machine Learning detection for dropped file
Machine Learning detection for sample
Maps a DLL or memory area into another process
Queries sensitive BIOS Information (via WMI, Win32_Bios & Win32_BaseBoard, often done to detect virtual machines)
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Sigma detected: RegAsm connects to smtp port
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 access)
Writes to foreign memory regions
Yara detected AgentTesla
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 257563 Sample: import_Doc_images.exe Startdate: 05/08/2020 Architecture: WINDOWS Score: 100 56 smtp.office365.com 2->56 58 outlook.office365.com 2->58 60 3 other IPs or domains 2->60 86 Found malware configuration 2->86 88 Sigma detected: RegAsm connects to smtp port 2->88 90 Yara detected AgentTesla 2->90 92 3 other signatures 2->92 11 import_Doc_images.exe 4 2->11         started        15 apache.exe 2 2->15         started        17 apache.exe 1 2->17         started        signatures3 process4 file5 48 C:\Users\user\Import_Documents, PE32 11->48 dropped 50 C:\Users\user\AppData\...\HJdyTuap.exe, PE32 11->50 dropped 52 C:\Users\...\Import_Documents:Zone.Identifier, ASCII 11->52 dropped 110 Drops PE files to the user root directory 11->110 112 Drops PE files to the startup folder 11->112 114 Writes to foreign memory regions 11->114 116 2 other signatures 11->116 19 import_Doc_images.exe 11->19         started        22 RegAsm.exe 2 4 11->22         started        24 conhost.exe 15->24         started        26 conhost.exe 17->26         started        signatures6 process7 signatures8 94 Writes to foreign memory regions 19->94 96 Maps a DLL or memory area into another process 19->96 28 import_Doc_images.exe 19->28         started        31 RegAsm.exe 3 19->31         started        98 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 22->98 100 Queries sensitive BIOS Information (via WMI, Win32_Bios & Win32_BaseBoard, often done to detect virtual machines) 22->100 102 Hides that the sample has been downloaded from the Internet (zone.identifier) 22->102 process9 dnsIp10 118 Writes to foreign memory regions 28->118 120 Maps a DLL or memory area into another process 28->120 34 import_Doc_images.exe 28->34         started        37 RegAsm.exe 3 28->37         started        68 ZRH-efz.ms-acdc.office.com 52.97.232.226, 49732, 587 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 31->68 70 smtp.office365.com 31->70 72 2 other IPs or domains 31->72 122 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 31->122 124 Tries to steal Mail credentials (via file access) 31->124 126 Hides that the sample has been downloaded from the Internet (zone.identifier) 31->126 signatures11 process12 dnsIp13 74 Writes to foreign memory regions 34->74 76 Maps a DLL or memory area into another process 34->76 40 import_Doc_images.exe 34->40         started        43 RegAsm.exe 34->43         started        62 52.97.186.18, 49733, 587 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 37->62 64 smtp.office365.com 37->64 66 3 other IPs or domains 37->66 78 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 37->78 80 Tries to steal Mail credentials (via file access) 37->80 82 Tries to harvest and steal ftp login credentials 37->82 84 2 other signatures 37->84 signatures14 process15 file16 104 Writes to foreign memory regions 40->104 106 Maps a DLL or memory area into another process 40->106 46 RegAsm.exe 40->46         started        54 C:\Users\user\AppData\Roaming\...\apache.exe, PE32 43->54 dropped 108 Hides that the sample has been downloaded from the Internet (zone.identifier) 43->108 signatures17 process18
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/6fa3a8b31b5aa450afc06a2a08149af42ef62ae7be55d93db25ec2c3e3edb93f/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2020-08-05 02:06:39 UTC
AV detection:
22 of 29 (75.86%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=n6r2rmy3lksfbl6anivaqfe26qxpmkxhxzk5spnsl3bmhy7nxe7q._file
Verdict:
malicious
Label(s):
agenttesla
Create hunting rule
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AgentTesla
+ 10'686 additional samples on MalwareBazaar
Result
Malware family:
agenttesla
Create hunting rule
Score:
  10/10
Tags:
keylogger stealer persistence trojan spyware family:agenttesla
Link:
https://tria.ge/reports/200805-eh2r4mzbas/
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Adds Run key to start application
Drops startup file
AgentTesla Payload
AgentTesla
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
AgentTesla
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/6fa3a8b31b5aa450afc06a2a08149af42ef62ae7be55d93db25ec2c3e3edb93f

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:Agenttesla_type2
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Agenttesla in memory
Reference:internal research
Rule name:CAP_HookExKeylogger
Create hunting rule
Author:Brian C. Bell -- @biebsmalwareguy
Reference:https://github.com/DFIRnotes/rules/blob/master/CAP_HookExKeylogger.yar
Rule name:win_agent_tesla_w1
Create hunting rule
Author:govcert_ch
Description:Detect Agent Tesla based on common .NET code sequences

File information

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

Malspam

AgentTesla

rar 819be106973a4108d8b044ce861b4527cde5327cfecf9d76964494098d38abc0

AgentTesla

Executable exe 6fa3a8b31b5aa450afc06a2a08149af42ef62ae7be55d93db25ec2c3e3edb93f

(this sample)

  
Dropped by
MD5 cd46a59a7bf8b4f7ae4d55c24b0083bb
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/39218/
  
Dropped by
SHA256 819be106973a4108d8b044ce861b4527cde5327cfecf9d76964494098d38abc0

Comments