MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b038873608088e7d9f054df77e88fa0b9ada18062e5977f57b5278755735cb73. 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: 7


Maldoc score: 11


Intelligence 7 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b038873608088e7d9f054df77e88fa0b9ada18062e5977f57b5278755735cb73
SHA3-384 hash: 66bd0924fcbd970d1ea42b03d4a4ca3dc20dcb38a8f74bb82d48d54bdf4318422f7ecdb9655ac6dfe7a67b1ac09447b3
SHA1 hash: 4b9b8f2b5d0bbe7aabfaca08a6518cdeee00ed6e
MD5 hash: 233e6cecdf2f1995262c068348f37c3f
humanhash: skylark-coffee-papa-zebra
File name:6021557.xls
Download: download sample
Signature AgentTesla
Create hunting rule
File size:313'344 bytes
First seen:2020-11-19 07:45:46 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 6144:hk3hOdsylKlgryzc4bNhZF+E+W2knYPJVbTcgi+VLvuD+ktY5ljqv2tul0dJdpak:1BQ+mKxbtuaPdpCHccnXw
TLSH 2D641293B6D9D546DE2727310CEB48804712FC669EB7939AB212FB1C1FB36D0521223B
Reporter abuse_ch
Tags:AgentTesla xls


Avatar
abuse_ch
Malspam distributing AgentTesla:

HELO: vmv0.511.vuniso.ml
Sending IP: 143.110.173.73
From: frebekah515@msn.com
Subject: ORDER : RAW P6317
Attachment: 6021557.xls

AgentTesla payload URL:
http://sparepartiran.com/js/d1/8YAOuE8zfTpo1M9.exe

AgentTesla SMTP exfil server:
mail.hojokk.com:587

AgentTesla SMTP exfil email address:
andrea@hojokk.com

Office OLE Information

This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 11
Application name is unknown
Office document is in OLE format
Office document contains VBA Macros
OLE dump

MalwareBazaar was able to identify 10 sections in this file using oledump:

Section IDSection sizeSection name
1107 bytesCompObj
2248 bytesDocumentSummaryInformation
3176 bytesSummaryInformation
4304085 bytesWorkbook
5520 bytes_VBA_PROJECT_CUR/PROJECT
6137 bytes_VBA_PROJECT_CUR/PROJECTwm
71371 bytes_VBA_PROJECT_CUR/VBA/ThisWorkbook
87 bytes_VBA_PROJECT_CUR/VBA/_VBA_PROJECT
9287 bytes_VBA_PROJECT_CUR/VBA/dir
10197 bytes_VBA_PROJECT_CUR/VBA/ytqulgfzkoxqhfgaydqknqfaniisere
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecWorkbook_OpenRuns when the Excel Workbook is opened
IOC8YAOuE8zfTpo1M9.exeExecutable file name
IOCioqgcynvsjmgpjglkzcxExecutable file name
SuspiciousShellMay run an executable file or a system command
SuspiciousvbNormalNoFocusMay run an executable file or a system command
SuspiciousLibMay run code from a DLL
SuspiciousURLDownloadToFileAMay download files from the Internet
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
1
# of downloads :
130
Origin country :
n/a
Vendor Threat Intelligence
Detection(s):
SecuriteInfo.com.Exploit.Siggen3.1159.27030.1477.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Creating a file
Creating a process with a hidden window
Creating a file in the %AppData% directory
Creating a file in the %temp% directory
Launching a process
Deleting a recently created file
Using the Windows Management Instrumentation requests
Launching a file downloaded from the Internet
Unauthorized injection to a recently created process by context flags manipulation
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Enabling autorun by creating a file
Result
Verdict:
SUSPICIOUS
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
Macro with DLL Reference
Detected macro logic that will load additional functionality from Dynamically Linked Libraries (DLLs). While not explicitly malicious, this is a common tactic for accessing APIs that are not otherwised exposed via Visual Basic for Applications (VBA).
Result
Threat name:
AgentTesla
Create hunting rule
Detection:
malicious
Classification:
troj.adwa.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/542409
Signature
.NET source code contains very large array initializations
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA macro with suspicious strings
Document exploit detected (creates forbidden files)
Document exploit detected (drops PE files)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Drops PE files to the user root directory
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
Machine Learning detection for dropped file
Machine Learning detection for sample
May check the online IP address of the machine
Modifies the hosts file
Multi AV Scanner detection for domain / URL
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 process drops PE file
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: Executables Started in Suspicious Folder
Sigma detected: Execution in Non-Executable Folder
Sigma detected: MS Office Product Spawning Exe in User Dir
Sigma detected: Scheduled temp file as task from temp location
Sigma detected: Suspicious Program Location Process Starts
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 access)
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AgentTesla
Yara detected AntiVM_3
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 320311 Sample: 6021557.xls Startdate: 19/11/2020 Architecture: WINDOWS Score: 100 41 Multi AV Scanner detection for domain / URL 2->41 43 Found malware configuration 2->43 45 Multi AV Scanner detection for dropped file 2->45 47 20 other signatures 2->47 7 EXCEL.EXE 57 24 2->7         started        process3 dnsIp4 39 sparepartiran.com 162.223.88.131, 49165, 80 COLOUPUS United States 7->39 25 C:\Users\user\...\8YAOuE8zfTpo1M9[1].exe, PE32 7->25 dropped 27 ioqgcynvsjmgpjglkz...rvqookyhbqyajxp.exe, PE32 7->27 dropped 57 Document exploit detected (creates forbidden files) 7->57 59 Document exploit detected (process start blacklist hit) 7->59 61 Document exploit detected (UrlDownloadToFile) 7->61 12 ioqgcynvsjmgpjglkzcxrnxyicxitprvqookyhbqyajxp.exe 2 8 7->12         started        file5 signatures6 process7 file8 29 C:\Users\user\AppData\...\BpUiFIjgBytk.exe, PE32 12->29 dropped 31 C:\Users\user\AppData\Local\Temp\tmpBE4.tmp, XML 12->31 dropped 63 Multi AV Scanner detection for dropped file 12->63 65 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 12->65 67 Machine Learning detection for dropped file 12->67 69 2 other signatures 12->69 16 ioqgcynvsjmgpjglkzcxrnxyicxitprvqookyhbqyajxp.exe 12 4 12->16         started        21 schtasks.exe 12->21         started        signatures9 process10 dnsIp11 33 mail.hojokk.com 167.88.170.103, 49168, 587 PONYNETUS United States 16->33 35 elb097307-934924932.us-east-1.elb.amazonaws.com 174.129.214.20, 443, 49166 AMAZON-AESUS United States 16->35 37 2 other IPs or domains 16->37 23 C:\Windows\System32\drivers\etc\hosts, ASCII 16->23 dropped 49 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 16->49 51 Tries to steal Mail credentials (via file access) 16->51 53 Tries to harvest and steal ftp login credentials 16->53 55 3 other signatures 16->55 file12 signatures13
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b038873608088e7d9f054df77e88fa0b9ada18062e5977f57b5278755735cb73/
Threat name:
Script-Macro.Trojan.Negasteal
Create hunting rule
Status:
Malicious
First seen:
2020-11-19 06:23:31 UTC
AV detection:
20 of 29 (68.97%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=wa4ionqibchh3hyfjx3x5ch2bonnugagfzmxp5l3kj4hkvzvznzq._file
Result
Malware family:
agenttesla
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla keylogger persistence spyware stealer trojan
Link:
https://tria.ge/reports/201119-swtfh2zja2/
Behaviour
Creates scheduled task(s)
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Checks processor information in registry
Suspicious use of FindShellTrayWindow
Office loads VBA resources, possible macro or embedded object present
Modifies service
Suspicious use of SetThreadContext
Looks up external IP address via web service
Loads dropped DLL
Reads data files stored by FTP clients
Reads user/profile data of local email clients
Reads user/profile data of web browsers
Drops file in Drivers directory
Executes dropped EXE
AgentTesla
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:ach_AgentTesla_20200929
Create hunting rule
Author:abuse.ch
Description:Detects AgentTesla PE
Rule name:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria
Rule name:win_agent_tesla_v1
Create hunting rule
Author:Johannes Bader @viql
Description:detects Agent Tesla

File information

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

Malspam

AgentTesla

Excel file xls b038873608088e7d9f054df77e88fa0b9ada18062e5977f57b5278755735cb73

(this sample)

AgentTesla

Executable exe 4ed26280f05b2a930b2439cc4e853cf11c6df47f6654cd0a0a6662df85d7e230

  
URLhaus
https://urlhaus.abuse.ch/url/832107/
  
Delivery method
Distributed via e-mail attachment
  
Dropping
SHA256 4ed26280f05b2a930b2439cc4e853cf11c6df47f6654cd0a0a6662df85d7e230
  
Dropping
MD5 7e305229b6f13f866e2cae249318c9e3

Comments