Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 707a16b11215ebae…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:11 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: e14501f12d405031e96c91e0e620c9a1 SHA-1: 7b3e3e59f1b0b092146ebfc053e0e85a71816e0c SHA-256: 707a16b11215ebae2a0f04f3d432294364e7134a27f1b72da15fa22dcea5070a
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 function, which is a common technique for executing malicious code when the workbook is opened. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting an attempt to run arbitrary commands or exploit vulnerabilities. No specific URLs or hashes were extracted, but the presence of the Auto_Open macro is a strong indicator of 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) 6657 bytes
SHA-256: 1eaa0af040380033da043240d9efc58a8551e89bb0b1b8caa13722850b47661e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EiewuA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E186 
' 0018     26 LABEL : Cell Value, String Constant - dpThsXgJdsO len=0 
' 0018     24 LABEL : Cell Value, String Constant - eFLtqleAu len=0 
' 0018     22 LABEL : Cell Value, String Constant - EpUDIyP len=0 
' 0018     21 LABEL : Cell Value, String Constant - iuXHQQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - JaVUVCsNTcQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - kcnHX len=0 
' 0018     21 LABEL : Cell Value, String Constant - MwKGUt len=0 
' 0018     25 LABEL : Cell Value, String Constant - nIKpbheqXz len=0 
' 0018     23 LABEL : Cell Value, String Constant - nxQTBnvM len=0 
' 0018     20 LABEL : Cell Value, String Constant - oDsGq len=0 
' 0018     22 LABEL : Cell Value, String Constant - QfcjRVD len=0 
' 0018     22 LABEL : Cell Value, String Constant - QLDPgho len=0 
' 0018     25 LABEL : Cell Value, String Constant - RSubmAhtvg len=0 
' 0018     24 LABEL : Cell Value, String Constant - sNAnUcMIc len=0 
' 0018     22 LABEL : Cell Value, String Constant - spOrNrp len=0 
' 0018     21 LABEL : Cell Value, String Constant - ttdYRx len=0 
' 0018     26 LABEL : Cell Value, String Constant - TuRrDkGLUZg len=0 
' 0018     20 LABEL : Cell Value, String Constant - VMeBU len=0 
' 0018     23 LABEL : Cell Value, String Constant - YGBzajuk len=0 
' 0018     26 LABEL : Cell Value, String Constant - yVvlFUFfCrz 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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