Office (OLE) / .XLSX malware analysis — malicious · cb56c48384a70c5a

MALICIOUS

Office (OLE) / .XLSX

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

MD5: a82a428886de60e862686673a68d5d17 SHA-1: 1606f8f7e7bdecfe89cc475e2e670988328a5b01 SHA-256: cb56c48384a70c5a2e8398f4ca3f140ccb3eb326734b194c647ad72bb372ed0c

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic

The file contains VBA macros that utilize `CreateObject` to instantiate `Wscript.Shell` and `Scripting.FileSystemObject`. The `Workbook_Open` macro is configured to execute, and it appears to be constructing commands to download and run payloads from several URLs. Specifically, it attempts to execute a batch file located at `c:\programdata\jledshf.bat` and a VBScript at `c:\programdata\sduoixo.vbs`. The script also contains a long, obfuscated string that reconstructs to multiple URLs, likely serving as download sources for the second-stage payload. The presence of `Wscript.Shell` and the execution of a `Workbook_Open` macro strongly indicate a malicious intent to download and run further malicious code.

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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