Office (OOXML) / .XLSX malware analysis — malicious · c8f65b6c4b62a61e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b62911de20596125abe430f0e661c648 SHA-1: 9a9bd06d37d1fc5313ff807df9a485fb35963329 SHA-256: c8f65b6c4b62a61e56556931ed8649c0ae905a4c60de4c9a5f83503759b4ec9a

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 sample is identified as malicious by ClamAV. The embedded VBA macro contains a Workbook_Open event that executes obfuscated commands. These commands attempt to create and execute a batch file ('jledshf.bat') and a VBScript ('sduoixo.vbs') from the 'c:\programdata' directory. The VBScript appears to be responsible for downloading payloads from multiple URLs, including 'http://reumatismclinic.com/--/scCn m3mbJRpwsaKBbrC/'. The VBA code also contains obfuscated strings that, when reconstructed, reveal several URLs 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` `97856b949038e2a152f06ad6eae774c660dac4aab2b60813c50bea36a83f0564`	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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