Office (OOXML) / .XLSX malware analysis — malicious · 89f186ad1029dd60

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 9bf99e8fa51ba27cfc384aa58baafe5f SHA-1: e00ce1926ef803acff7c17f2a9fe110fc038ed88 SHA-256: 89f186ad1029dd60dc5b2384f7b4ff4f0009980ae90de0dc3cd4182543f923cd

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1059.001 PowerShell

The file is an Excel document containing a Workbook_Open macro that executes a VBScript. The VBScript is designed to download and execute a batch file from a hardcoded URL. The script also attempts to create a scheduled task or run a malicious VBS file. The presence of the ClamAV detection 'Doc.Malware.Valyria-10004384-0' further confirms its malicious nature. The reconstructed URL for the payload download is 'http://reumatismlininc.com/./scCn m3mbJRpwsaKBbrC/'.

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` `8dfb91ad38d910cfc7ea3a2c194d62c987c80283bda9e9a19109718fc1eb5d44`	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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