Office (OLE) / .XLSX malware analysis — malicious · 59afdd6a528dcec0

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 720ec837c24bb44a5146150151f57189 SHA-1: 3f93e0b2c3eed492430d141ebc0f86cca5e3cc4c SHA-256: 59afdd6a528dcec0790ff5874509e4dca5fe3e97831146d03b1c96ddcdeeed8f

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that utilizes Wscript.Shell to execute commands. The macro constructs a long string which appears to be a list of URLs, likely for downloading a second-stage payload. The reconstructed URL string is: "http://santoftoritilla.com/_baks/_tUX9/,http://donbaham.com/Home_files/YS0PAPzXyerase/,http://barnhart-studies.com/eln-images/vggh1nb/ ,http://blute.com/3dtech/jLu8IAnnj3gK9WC/,http://zenzebra.net/plath/9Q0DBLE/,http://reacour.net/PhotoGallery/Uw mRHceSGbaCeGF/,http://miniflam.com/eln-images/fSwbQjU M AfGxdw/,http://marezdecor.com/MarezGallery/sEQxWTpMJ7A8rAtY/". Additionally, it attempts to write to the file system with paths like c:\programdata\yhjlswle.vbs and c:\programdata\ughldskbhn.bat.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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