Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3b04d0141f72bce0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:11 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: 9fa140b5b1afecb4359414fad78c4fb4 SHA-1: 2f14270a74ef3f0d93f835100df63b539a9a7551 SHA-256: 3b04d0141f72bce0aa7cef4084b07117190195193ceb6508ee6af85d93c22f14
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the XLM macro, suggesting it is designed to perform harmful actions. No specific URLs or further payloads were extracted, but the Auto_Open macro is the primary execution vector.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6739 bytes
SHA-256: f04775ac5db6eea83d456fa8e5c4d885c96353e869f92383b1f9f74288077b42
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UTMqvePF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C153 
' 0018     26 LABEL : Cell Value, String Constant - ctPtTZCGsrE len=0 
' 0018     21 LABEL : Cell Value, String Constant - DoXiEe len=0 
' 0018     24 LABEL : Cell Value, String Constant - dVBOnXklc len=0 
' 0018     26 LABEL : Cell Value, String Constant - edBHKxXCyMQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - EEHHEAhdZCm len=0 
' 0018     24 LABEL : Cell Value, String Constant - gVWDLoMSx len=0 
' 0018     21 LABEL : Cell Value, String Constant - gXMIJS len=0 
' 0018     21 LABEL : Cell Value, String Constant - IxuQTd len=0 
' 0018     24 LABEL : Cell Value, String Constant - jaPRhQPNf len=0 
' 0018     25 LABEL : Cell Value, String Constant - JbFDFfymIc len=0 
' 0018     27 LABEL : Cell Value, String Constant - KfXCJEvUqMju len=0 
' 0018     20 LABEL : Cell Value, String Constant - KOeJR len=0 
' 0018     23 LABEL : Cell Value, String Constant - kPplowWF len=0 
' 0018     21 LABEL : Cell Value, String Constant - Mzjqru len=0 
' 0018     26 LABEL : Cell Value, String Constant - NChcWbZCMyE len=0 
' 0018     20 LABEL : Cell Value, String Constant - NiQwx len=0 
' 0018     27 LABEL : Cell Value, String Constant - tTaSvBAvnNmh len=0 
' 0018     20 LABEL : Cell Value, String Constant - vQWiG len=0 
' 0018     23 LABEL : Cell Value, String Constant - wDeFAoKr len=0 
' 0018     22 LABEL : Cell Value, String Constant - wMrVdqM len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     
... (truncated)

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