Office (OLE) / .XLSX malware analysis — malicious · fc9abd9cc037df72

MALICIOUS

Office (OLE) / .XLSX

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

MD5: fd9baa218d9debc8f1f5c18150d14db1 SHA-1: 227240f78dd824abcd5056a8fbe276246fa346a4 SHA-256: fc9abd9cc037df7297f0b57439eac640cbbeedc8fab4c215d4c5326e9a5f2d5a

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a macro-enabled Excel file that contains a Workbook_Open macro. This macro utilizes Wscript.Shell to execute a batch file and a VBScript. The VBScript appears to be designed to download and execute a second-stage payload from a list of URLs. The reconstructed URL is "http://goyaluaat.vmesha.in/0v6kcny/CG/ ,https://mars.srl/wp-admin/7Ffk6LN2Yx2W/,http://franmuler.es/mbx/8c5RBGjx6/,http://varafood.com/Ajax/cnM91G/,https://7jcatt.com/wp-content/t/ ,http://blog.centralhome.com/mbx/8c5RBGjx6/". The presence of Wscript.Shell and CreateObject calls, along with the execution of external scripts, strongly indicates 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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