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

Static analysis result for SHA-256 68789b50f1baa45e…

MALICIOUS

Office (OLE) / .XLSX

653.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: b49051fc5d4535900df47660e3e4b05b SHA-1: f9331cfa8f971f4f34111bf9d1098929984c7066 SHA-256: 68789b50f1baa45e3b689cbd57d552027508788b4df5ea4893b50ab5615ef6aa
302 Risk Score

Malware Insights

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

The presence of a Workbook_Open macro that calls the Shell() function indicates an attempt to execute arbitrary code upon opening the Excel file. The macro likely uses CreateObject to launch Windows Script Host, which is then used to download and execute a secondary payload. The ClamAV detection of 'Xls.Packed.Logan-9738662-0' further supports the malicious nature of the file.

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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