Office (OOXML) / .XLSX malware analysis — malicious · 7e8e8db9fe19a6c7

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 353f012599ff141d0fb548d191dadd59 SHA-1: 0bd6a354a8a4990d2551abbde72a6a572e97ebf9 SHA-256: 7e8e8db9fe19a6c79766996993f164ff5b4f07fb8dc6314ceb65b9bcd67c8888

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 a macro-enabled Excel document detected by ClamAV as Doc.Malware.Valyria-10004384-0. The Workbook_Open macro is present and uses CreateObject to execute a batch file named 'jledshf.bat' and a VBScript named 'sduoixo.vbs' from the 'c:\programdata\' directory. The VBScript appears to be a downloader for multiple URLs, including 'http://reumatismclinic.com/--/scCn3mbJRp8bKbrC/'. The VBA script also contains obfuscated strings that appear to be URLs, which are likely used for payload delivery.

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` `2567c8630f2bae033010b5c485ddd07c7049130c2f0224d7c902e96734828f83`	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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