MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 4c192fc1dc7f635c130772d20f28ae4f5457cf1472b66a12f3dc25fec4c8113b. 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
NanoCore
Vendor detections: 13
Maldoc score: 9
| SHA256 hash: | 4c192fc1dc7f635c130772d20f28ae4f5457cf1472b66a12f3dc25fec4c8113b |
|---|---|
| SHA3-384 hash: | 89d3d75f7bfefc36b7f06236015543b32cc4472004c3d0fc824f907ea291ea68290b030480f17c59de95bc82f8d58509 |
| SHA1 hash: | 6e22468d713f79be3d6242a3a887aa4af32af7f6 |
| MD5 hash: | cb3ed9e7ac3dc938675beb98a1de4479 |
| humanhash: | coffee-king-indigo-spring |
| File name: | SFA invoice.xlsm |
| Download: | download sample |
| Signature | NanoCore |
| File size: | 27'916 bytes |
| First seen: | 2022-02-28 08:23:54 UTC |
| Last seen: | Never |
| File type: |  xlsm |
| MIME type: | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| ssdeep | 768:l2srFp7RHizQYeHeCBcaC34jImh7LKMiiJ+QE:00eHezsKtiixE |
| TLSH | T1E8C2C0E65F163B65C346083A092589026A243467C78ABC539F297A3C76C3ED11F6FF4E |
| Reporter |  abuse_ch |
| Tags: | NanoCore xlsm |
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: 9 |
OLE dump
MalwareBazaar was able to identify 8 sections in this file using oledump:
| Section ID | Section size | Section name |
|---|---|---|
| A1 | 527 bytes | PROJECT |
| A2 | 89 bytes | PROJECTwm |
| A3 | 169 bytes | VBA/Sheet1 |
| A4 | 343 bytes | VBA/ThisWorkbook |
| A5 | 171 bytes | VBA/Workbook |
| A6 | 7 bytes | VBA/_VBA_PROJECT |
| A7 | 228 bytes | VBA/dir |
OLE vba
MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:
| Type | Keyword | Description |
|---|---|---|
| AutoExec | Workbook_Open | Runs when the Excel Workbook is opened |
| IOC | 13.231.238.12 | IPv4 address |
| IOC | certutil.exe | Executable file name |
| IOC | Gymxy.bat | Executable file name |
| IOC | Avqhtbjfsskrzp.exe | Executable file name |
| Suspicious | Shell | May run an executable file or a system command |
| Suspicious | vbHide | May run an executable file or a system command |
| Suspicious | Hex Strings | Hex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
| Suspicious | Base64 Strings | Base64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
Intelligence
File Origin
# of uploads :
1
# of downloads :
243
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/vnd.ms-excel.sheet.macroEnabled.12
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Result
Verdict:
Malware
Maliciousness:
Behaviour
Searching for the window
Sending a custom TCP request
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Launching a process
Sending an HTTP GET request
Creating a file
Creating a process from a recently created file
Unauthorized injection to a recently created process
Running batch commands by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Excel File with Macro
Payload URLs
URL
File name
http://13.231.238.12/board/Gymxy.bat
ThisWorkbook
Document image
Image:
Verdict:
Malicious
Threat level:
10/10
Confidence:
100%
Tags:
certutil certutil.exe cmd macros macros-on-open
Label:
Malicious
Suspicious Score:
9.9/10
Score Malicious:
1%
Score Benign:
0%
Result
Verdict:
MALICIOUS
Link:
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
IPv4 Dotted Quad URL
A URL was detected referencing a direct IP address, as opposed to a domain name.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
InQuest Machine Learning
An InQuest machine-learning model classified this macro as potentially malicious.
Document With No Content
Document contains little or no semantic information.
Result
Threat name:
AgentTesla
Detection:
malicious
Classification:
troj.adwa.expl.evad
Score:
100 / 100
Signature
.NET source code contains potential unpacker
.NET source code contains very large array initializations
Document contains an embedded VBA macro which may execute processes
Document exploit detected (process start blacklist hit)
Drops PE files to the document folder of the user
Found malware configuration
Injects a PE file into a foreign processes
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Modifies the hosts 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)
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: Microsoft Office Product Spawning Windows Shell
Sigma detected: Suspicious Certutil Command
Sigma detected: Windows Shell File Write to Suspicious Folder
System process connects to network (likely due to code injection or exploit)
Yara detected AgentTesla
Behaviour
Behavior Graph:
Threat name:
Document-Excel.Downloader.Powdow
Status:
Malicious
First seen:
2022-02-28 02:50:16 UTC
File Type:
Document
Extracted files:
26
AV detection:
18 of 42 (42.86%)
Threat level:
3/5
Detection(s):
Suspicious file
Result
Malware family:
nanocore
Score:
10/10
Tags:
family:agenttesla family:nanocore collection evasion keylogger macro persistence spyware stealer trojan
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
outlook_office_path
outlook_win_path
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Adds Run key to start application
Checks whether UAC is enabled
Checks computer location settings
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
Executes dropped EXE
Downloads MZ/PE file
Drops file in Drivers directory
AgentTesla Payload
AgentTesla
NanoCore
Process spawned unexpected child process
Malware Config
C2 Extraction:
2.56.56.96:111
Malware family:
Agent Tesla v3
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Malspam
Delivery method
Distributed via e-mail attachment
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