Office (OOXML) / .XLSX malware analysis — malicious · 1f0cfe3d1b8f4a10

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: df8db8014b84fcb5c68c676baaff23c9 SHA-1: 8c7143545ac4024f2052e7f45bab45e0e2c9eee9 SHA-256: 1f0cfe3d1b8f4a10c782f7c440439a66b9a5a43a9f0ba0f89455da4482cea0a8

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is an Excel document containing a Workbook_Open macro, a common technique for executing malicious code upon opening. The macro attempts to create a FileSystemObject to write and execute a VBScript from the programdata directory. It also constructs a batch file and attempts to download payloads from multiple URLs, including 'http://reumatisclinic.com/-/scCn3mBmJRp8bKbrC/', 'https://shodmanjar.com/wp-admin/xJE4X4Qm3N/', 'http://tubelocal.net/wp-admin/X4Xm4Mk/', 'https://pacifichomebroker.com/roderick/RRk/', and 'https://molina-journal.com/roderic/RRk/'. The VBA script's obfuscated nature and the multiple download URLs suggest a downloader or droppper functionality.

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` `e112679a954f6f1db56d1f2fc2239531818786b0af9582bf0bafb2dce114aa86`	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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