Office (OOXML) / .XLSX malware analysis — malicious · 1e9e9f2e31c4b71c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e448da7dc94623ba85eb6a5ece1b5a14 SHA-1: 98990e505c19d70fe3981dc9daff62ee1593eccf SHA-256: 1e9e9f2e31c4b71ccaeb943fdb21922c8f658a2c9218eb7062ea2224cff1a6b1

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document with a Workbook_Open macro that executes a batch file and a VBScript. The batch file appears to be obfuscated and attempts to download files from multiple URLs. The VBScript is also obfuscated but seems to be related to file system operations and execution. The ClamAV detection 'Doc.Malware.Valyria-10004384-0' strongly suggests malicious intent, likely a downloader or droppper. The reconstructed URL 'http://reumatismlinik.com/--/scCn m3mbJRpwBKBbrC/' is a key indicator of the malicious infrastructure.

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` `6a57be3b08f59672c295dfbbf0cbe8f180454d7fb8b1cf0d649e7d742de3a138`	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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