Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e77ad9b6b9a62ac…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:39:22 Authoring application: Microsoft Excel First seen: 2021-11-02
MD5: 3ea4cefea29a4cd0d9c50a481be78b82 SHA-1: e3781b69a6ba20d47d41667aa2dfe02c9685adba SHA-256: 7e77ad9b6b9a62ac7339c20482992d3391333362c5c4afa24bcc11f2c08f776e
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open macro. This macro is designed to execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN indicates that the macro is intended to execute arbitrary code, likely downloading and executing a second-stage payload. No specific family could be identified.

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) 6654 bytes
SHA-256: 9f796ff5c494bce002835b6a5dffe5c742ad879f44a31d8ffbbf5b7470aa6c74
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  buRidnpNsWL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H151 
' 0018     25 LABEL : Cell Value, String Constant - AWTpAhZXML len=0 
' 0018     27 LABEL : Cell Value, String Constant - ConSKYYhbqKG len=0 
' 0018     22 LABEL : Cell Value, String Constant - dxLQJCO len=0 
' 0018     24 LABEL : Cell Value, String Constant - iEQGxDpqE len=0 
' 0018     21 LABEL : Cell Value, String Constant - KBczZf len=0 
' 0018     20 LABEL : Cell Value, String Constant - MdRSX len=0 
' 0018     24 LABEL : Cell Value, String Constant - ouFcIPLgi len=0 
' 0018     25 LABEL : Cell Value, String Constant - qBJNAsVLKn len=0 
' 0018     21 LABEL : Cell Value, String Constant - qBRvSc len=0 
' 0018     20 LABEL : Cell Value, String Constant - QVmHF len=0 
' 0018     21 LABEL : Cell Value, String Constant - RzSbIA len=0 
' 0018     23 LABEL : Cell Value, String Constant - TEqruvqf len=0 
' 0018     22 LABEL : Cell Value, String Constant - UkRCtOV len=0 
' 0018     26 LABEL : Cell Value, String Constant - UPGInKIeulp len=0 
' 0018     24 LABEL : Cell Value, String Constant - uXAYHecXz len=0 
' 0018     24 LABEL : Cell Value, String Constant - vMLSxdAYZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - vWgBwbjTOt len=0 
' 0018     26 LABEL : Cell Value, String Constant - XALwoybAyLp len=0 
' 0018     25 LABEL : Cell Value, String Constant - XBNrgBDIUm len=0 
' 0018     23 LABEL : Cell Value, String Constant - yvfrpuBU 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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