Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8ad095f9f6c03269…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:44:03 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: ce21dc4833fa9c6607adb51c8c0c8edd SHA-1: 80dd9c373b38013753016613bb3ccaff63b2f89e SHA-256: 8ad095f9f6c03269d299843a779b4178d59a1bc3786e24df53ffa07fa8ca1ce5
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, identified by critical heuristics indicating the presence of an Auto_Open macro. This macro is designed to execute dangerous formula APIs, specifically the RUN function, which is commonly used to launch external executables or scripts. The macro sheet likely serves as a loader for a secondary malicious payload.

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) 6447 bytes
SHA-256: 4e0058ee0cf4c53c22d630b1ad8ca69fb54d14bd248c5aa04e1ac1982c8bd1c9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  oDxP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B184 
' 0018     25 LABEL : Cell Value, String Constant - AvMqbdAyvo len=0 
' 0018     22 LABEL : Cell Value, String Constant - czucrUD len=0 
' 0018     23 LABEL : Cell Value, String Constant - dqQkHYSw len=0 
' 0018     26 LABEL : Cell Value, String Constant - funDBDleKmr len=0 
' 0018     27 LABEL : Cell Value, String Constant - irfDLmCbwCaU len=0 
' 0018     22 LABEL : Cell Value, String Constant - IROufvr len=0 
' 0018     27 LABEL : Cell Value, String Constant - ivTCckBUnYGa len=0 
' 0018     27 LABEL : Cell Value, String Constant - jFHwwdaweZkr len=0 
' 0018     23 LABEL : Cell Value, String Constant - KAPyAnxg len=0 
' 0018     23 LABEL : Cell Value, String Constant - KMlSeFsq len=0 
' 0018     26 LABEL : Cell Value, String Constant - LRbjNQrzSvT len=0 
' 0018     27 LABEL : Cell Value, String Constant - mRyVYQtEpmjy len=0 
' 0018     22 LABEL : Cell Value, String Constant - PsZNItc len=0 
' 0018     23 LABEL : Cell Value, String Constant - qMVEtzhe len=0 
' 0018     24 LABEL : Cell Value, String Constant - THVzhiAdn len=0 
' 0018     23 LABEL : Cell Value, String Constant - xceztrue len=0 
' 0018     20 LABEL : Cell Value, String Constant - yLmjN len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZaJZnlMwabWj len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZGrDfgR len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZNJBjivIElhL 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/ 
... (truncated)

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