Office (OOXML) / .XLSX malware analysis — malicious · ce03cbb5bb75250b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 43c3e53e2dd2a218e45aa91f1f5b40b0 SHA-1: 47f1736a669ce311f2294c781f5b74c5a8bf9998 SHA-256: ce03cbb5bb75250b0b2b20e69c47174941f4d841ce40eb9bc520b7d2ad077dac

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1027 Obfuscated Files or Information

The file contains a Workbook_Open macro that executes obfuscated commands. These commands attempt to create a batch file (c:\programdata\jledshf.bat) and a VBScript (c:\programdata\sduoixo.vbs). The VBScript is designed to download and execute payloads from multiple URLs, including http://reumatismclinic.com/-/-/scCn3mbJRpsBvbrC/. The ClamAV detection (Doc.Malware.Valyria-10004384-0) further confirms the malicious nature of this document.

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` `7d61937f5cacc5992f2c610f86d3a1c86f4a8e317821d0df77dfbd1692b2d7d3`	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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