Office (OOXML) / .XLSX malware analysis — malicious · 4fe47fe998da2dd2

MALICIOUS

Office (OOXML) / .XLSX

111.6 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: 06436e27ae2f622fb2a0f569c9951bc4 SHA-1: 1f980e83ea28ec6b91c1304a27f7d45a06685460 SHA-256: 4fe47fe998da2dd2a1c5d50c51746a9171f3f902c8d4befaeffbbef6ca41b6f2

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing a Workbook_Open VBA macro, which is a strong indicator of malicious intent. The macro is designed to execute a batch file and a VBScript located in the \`c:\programdata\\` directory. The script also attempts to download payloads from multiple URLs, including \`http://reumatismclinic.com/--/scCnm3mbJRpwBvbrC/\`, \`https://shodmanjar.com/wp-admin/xJE4M4Pd3N/\`, and others. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 6

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

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `42c594640d736f1068645958b2441d7c1e444920a086d29457e45d63d8a956aa`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 bytes
Detection ClamAV: Doc.Malware.Valyria-10004384-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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