Office (OOXML) / .XLSX malware analysis — malicious · bb47e668b2028ee2

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c506561612a0bd2f8560ea4dd24038b9 SHA-1: 2f009759f33ca3e68c66baa5631450f830de60ec SHA-256: bb47e668b2028ee27fc46ce7fada25054ab76b8a7633bd7968525e32256730cd

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is a macro-enabled Excel document detected by ClamAV as Doc.Malware.Valyria-10004384-0. The Workbook_Open macro is present and uses CreateObject to execute a batch file and a VBScript from the 'c:\programdata' directory. The script attempts to download and execute payloads from multiple URLs, including 'http://reumatismclinic.com/./scCn3mbJRpsBKBrc/'. The presence of the Workbook_Open macro and the execution of external scripts strongly indicate a malicious intent to download and run further stages of malware.

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` `a55708f112883db9a376f8bfabe6b15299377afaf4cbd5e70209bf721ae26aaa`	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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