Office (OOXML) / .XLSX malware analysis — malicious · e53ad622864f7852

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 9f936b65e329e2ff48b785be1d01d26d SHA-1: 0b939ce33a2a601ac1a4d017fe0dd6d23e53f8c7 SHA-256: e53ad622864f7852f562e13966e16d7219eb35f9f00fe0d18f0ad5a1f1f9484d

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 as malicious by ClamAV. The Workbook_Open macro is present, indicating automatic execution upon opening. The script attempts to create a file at 'c:\programdata\jledshf.bat' and another at 'c:\programdata\sduoixo.vbs', and then executes the batch file. The script also contains a long, obfuscated string that appears to be a list of URLs, likely for downloading a second-stage payload. The presence of the 'CreateObject' call and the execution of external files strongly suggest a downloader or dropper 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` `d076adc48a4ecb280862bbdee12233c70f26ffbde490cdb284b2f43c4f306e6b`	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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