Office (OLE) / .XLSX malware analysis — malicious · aefa9b2d98a23b7e

MALICIOUS

Office (OLE) / .XLSX

142.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: f2ec6f6b613a5720aae8ce36f0d9a0fe SHA-1: 6d690e795dd41112b59f95b05ec0934b662321b3 SHA-256: aefa9b2d98a23b7e847d7428cad688536130871e89b43fa26518ee040ee4232f

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros that are automatically executed upon opening, indicated by the Workbook_Open heuristic. The script utilizes CreateObject to interact with the system, specifically referencing Wscript.Shell and Scripting.FileSystemObject. It appears to construct and execute commands, including the creation of batch and VBScript files in the 'c:\programdata' directory. The script also attempts to download payloads from multiple URLs, such as 'http://goyaluaat.vmeshaa.in/0v6kcny/CG/7Ffk6LN2Xys2W/', which is a strong indicator of a downloader or droppper functionality.

Heuristics 7

ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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