Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0294fb2e48bda61c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:20 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: e3689f30af79fbdf96d008d8aa56f039 SHA-1: 1c0a9e3749218a24c574c0cb5a97dad42d324d98 SHA-256: 0294fb2e48bda61c4e7754cc78f20955379ba49cb6a67197f4842eca6ee3e170
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 sheet containing an Auto_Open entry, which is a critical finding indicating the potential for automatic execution of malicious code upon opening. The presence of dangerous formula APIs like RUN further supports this. The macro sheet itself contains obfuscated data, suggesting it's designed to hide its malicious intent.

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) 6566 bytes
SHA-256: e7f1b490c3f9145da36afa3fe15a42a471d8d502d11007be6ad7077bcd84a4b5
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 -  TwadlYXG
' 0018     20 LABEL : Cell Value, String Constant - aBqVK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B160 
' 0018     20 LABEL : Cell Value, String Constant - bdhgV len=0 
' 0018     23 LABEL : Cell Value, String Constant - bNzmVdcL len=0 
' 0018     21 LABEL : Cell Value, String Constant - cgvhsg len=0 
' 0018     21 LABEL : Cell Value, String Constant - dscwOR len=0 
' 0018     26 LABEL : Cell Value, String Constant - fMszNlpbNIV len=0 
' 0018     22 LABEL : Cell Value, String Constant - hcWMSNI len=0 
' 0018     22 LABEL : Cell Value, String Constant - jiXmoFF len=0 
' 0018     24 LABEL : Cell Value, String Constant - KyfXGsyUw len=0 
' 0018     21 LABEL : Cell Value, String Constant - mDfIlU len=0 
' 0018     25 LABEL : Cell Value, String Constant - mrDkhpHJtw len=0 
' 0018     24 LABEL : Cell Value, String Constant - OVXuABaWm len=0 
' 0018     21 LABEL : Cell Value, String Constant - owHSrq len=0 
' 0018     21 LABEL : Cell Value, String Constant - QsKZop len=0 
' 0018     25 LABEL : Cell Value, String Constant - qyGvoonHKX len=0 
' 0018     20 LABEL : Cell Value, String Constant - uaZIE len=0 
' 0018     26 LABEL : Cell Value, String Constant - VKkNHzfTxhs len=0 
' 0018     26 LABEL : Cell Value, String Constant - VmUfohHTxMt len=0 
' 0018     25 LABEL : Cell Value, String Constant - XQBaEbBVYs len=0 
' 0018     24 LABEL : Cell Value, String Constant - YhPlXqzAW 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     10 LABELSS
... (truncated)

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