Office (OOXML) / .XLSX malware analysis — malicious · e12e1384af85f6af

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: cc139b1ceb1a9c6cebc54eed85e26503 SHA-1: 66cfbbd25ec301128671c411ab5196779f84cd93 SHA-256: e12e1384af85f6affaeac75f6238fb876b11444a306c838baba3425b318cc8e1

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel document containing a Workbook_Open macro that executes obfuscated commands. The macro attempts to create a file named 'sduoixo.vbs' in 'c:\programdata\' and execute it, along with a batch file 'jledshf.bat'. The embedded VBA script also contains logic that appears to be for downloading payloads from multiple URLs, including 'http://reumatismclinic.com/-//scCnm3mbJRpsaKBbrC/'. 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` `4d599d81a1d7eb4d52e6b36fa1f4c8fa41e4ece273a3f5a625fa3deecd92560f`	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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