Office (OLE) / .XLSX malware analysis — malicious · bef93b3a24496537

MALICIOUS

Office (OLE) / .XLSX

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

MD5: b9139643ff60c3d902a1567cb7a8396c SHA-1: 1b312c1377d5521fc886260103498d7bb0c079d9 SHA-256: bef93b3a244965377f9117c66a0672993a4a454648d1f65b07cdfe7e404bd125

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The file contains VBA macros that are automatically executed upon opening, indicated by the Workbook_Open heuristic. The script uses `CreateObject("Wscript.Shell")` to execute commands. It constructs and runs two commands: one to execute `c:\programdata\yhjlswle.vbs` and another to execute `c:\programdata\ughldskbhn.bat`. The `SET wreDgdSdytDFf=hell -e` command appears to be constructing a PowerShell command to download a payload from multiple URLs, including `https://nabajyotifundation.com/da8uc7jo/4Za/` and `https://dwmaster.com/wp-content/eBH2UFY2/`. The ClamAV detection also confirms its malicious nature as a downloader.

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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