Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 5aa5980a3a575110…

MALICIOUS

Office (OLE) / .XLSX

679.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: 71cae4c7082e9cf84d9cbab3a634648c SHA-1: c29b8356193ac054a6e54f245b4fb5d88c3a674b SHA-256: 5aa5980a3a57511050441656ca0a12c2a72b8958f6869c533894e02029a7eaef
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The Excel file contains VBA macros that are triggered by the Workbook_Open event. These macros utilize the Shell() function, indicating an attempt to execute arbitrary code. The presence of packed content and a ClamAV signature for 'Xls.Packed.Logan-9738662-0' further supports its malicious nature. The exact payload executed by Shell() is not directly visible in the provided script excerpt, but the overall behavior points to a downloader or dropper.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Packed.Logan-9738662-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Packed.Logan-9738662-0
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c002a21b25eb16c7cf03a813431739fc85b8749f5f8d813ff87921f514f0b8e4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22654 bytes
ole10native_00.bin
50bbdd9fbbbbfb058d8ce90c36c6dd737df05c51155ec25e62815722e58296e1		 ole-package OLE Ole10Native stream: MBD00356439/Ole10Native 439791 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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