Office (OLE) / .XLSX malware analysis — malicious · a0bb08c5b45d579f

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 4a3f3e8b05416c42b99f349b29132d8c SHA-1: 5703655438ab29274224afa23a272a8a6bc359ec SHA-256: a0bb08c5b45d579ff6c70ff5446bed5b97a9247a1f032580790d239069134d31

280 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a macro-enabled Excel file that triggers a Workbook_Open event. This event uses `CreateObject` to instantiate `Wscript.Shell` and `Scripting.FileSystemObject`. The script then attempts to execute a batch file (`c:\programdata\jledshf.bat`) and a VBScript (`c:\programdata\sduoixo.vbs`), both of which are staged in `c:\programdata`. The VBScript appears to be a downloader, reconstructing a complex URL from concatenated strings: `http://goyaluaat.vmesha.in/0v6kcnky/CG/`, `https://mars.srl.pw/wp-admin/7Ffk6LN2X2W/`, `http://franmuler.es/mbx/8c5RBGjx6/`, `http://varafood.com/Ajax/cnM91G/`, `https://7jcata.com/wp-content/t/`, and `http://blog.centralhome.com/mbx/`. The VBA code also contains obfuscated commands and attempts to download payloads using `wscript.shell -e`.

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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