Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a303326b743f6d0…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:33:21 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 07954863d7e56632a9b7d829bfc146e4 SHA-1: 0a84e34141eddf231c1d4253ba875cce46ca1213 SHA-256: 2a303326b743f6d0b2433eca5a4bf83fa9fdbe26993773c080cf57272c3e6eb7
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 macros, specifically an Auto_Open macro. This macro is designed to execute arbitrary code upon opening the document, which is a common technique for delivering malware. The presence of dangerous formula APIs like RUN indicates the macro is intended to launch an external process or download a payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro code itself.

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) 6511 bytes
SHA-256: 6a89d3bc7902da2e03491448a9c3fd55fe395cbd272c1b9c3cebd14d07b076d4
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KQV
' 0018     27 LABEL : Cell Value, String Constant - aLivxlSDDdSc len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B168 
' 0018     27 LABEL : Cell Value, String Constant - DimHFeUvriIY len=0 
' 0018     23 LABEL : Cell Value, String Constant - dpTKYgdT len=0 
' 0018     20 LABEL : Cell Value, String Constant - EBuVC len=0 
' 0018     27 LABEL : Cell Value, String Constant - fSFxRqqyiKdn len=0 
' 0018     26 LABEL : Cell Value, String Constant - FynyTFODlJd len=0 
' 0018     27 LABEL : Cell Value, String Constant - IMQRnSazjAuA len=0 
' 0018     27 LABEL : Cell Value, String Constant - iuwJxYkvBKpM len=0 
' 0018     22 LABEL : Cell Value, String Constant - lbGrtQw len=0 
' 0018     22 LABEL : Cell Value, String Constant - mulcBEy len=0 
' 0018     24 LABEL : Cell Value, String Constant - oogHmPTOV len=0 
' 0018     22 LABEL : Cell Value, String Constant - pRHGiNd len=0 
' 0018     24 LABEL : Cell Value, String Constant - qKwvTXMVc len=0 
' 0018     20 LABEL : Cell Value, String Constant - SfzIW len=0 
' 0018     21 LABEL : Cell Value, String Constant - UKwVPp len=0 
' 0018     21 LABEL : Cell Value, String Constant - uvSSCn len=0 
' 0018     27 LABEL : Cell Value, String Constant - WNMHpmVLPhvg len=0 
' 0018     22 LABEL : Cell Value, String Constant - WQImcJh len=0 
' 0018     24 LABEL : Cell Value, String Constant - zjPLSmDXT len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZuhswiyGOwBw 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
' 0
... (truncated)

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