Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 02f72bad316711b9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:11 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: c6dba04de53ead6b41489c23640d9860 SHA-1: 64b3a0e84dadfc4f9bb88ab114280fcbba3526e5 SHA-256: 02f72bad316711b9af46571dacf51500bbdc5a42e4ab79ec681ca96af8ab0089
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The macros also utilize dangerous formula APIs, including 'RUN', suggesting an attempt to execute arbitrary commands. This strongly points to a macro-based downloader or dropper.

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) 6817 bytes
SHA-256: a6d880b3b527bcaa0cbcd3e7926b66843b81499a350807feed8f6b1b427894ae
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IjvWstmbXG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I143 
' 0018     21 LABEL : Cell Value, String Constant - boACLX len=0 
' 0018     23 LABEL : Cell Value, String Constant - bOpQMZay len=0 
' 0018     27 LABEL : Cell Value, String Constant - drslrpXnBpxb len=0 
' 0018     24 LABEL : Cell Value, String Constant - FUIaoyjie len=0 
' 0018     20 LABEL : Cell Value, String Constant - gxloa len=0 
' 0018     20 LABEL : Cell Value, String Constant - hfhJH len=0 
' 0018     25 LABEL : Cell Value, String Constant - lWqVGFfARr len=0 
' 0018     27 LABEL : Cell Value, String Constant - mRlqqKiiDcbd len=0 
' 0018     22 LABEL : Cell Value, String Constant - pwIMvcv len=0 
' 0018     25 LABEL : Cell Value, String Constant - RBqDmZZUDu len=0 
' 0018     23 LABEL : Cell Value, String Constant - rkyBgSrV len=0 
' 0018     21 LABEL : Cell Value, String Constant - rLglbi len=0 
' 0018     26 LABEL : Cell Value, String Constant - uERWKjsEsdF len=0 
' 0018     24 LABEL : Cell Value, String Constant - uzwUisYxV len=0 
' 0018     26 LABEL : Cell Value, String Constant - vFEFObOrSea len=0 
' 0018     23 LABEL : Cell Value, String Constant - wOgnNYaF len=0 
' 0018     22 LABEL : Cell Value, String Constant - WWzeaXI len=0 
' 0018     21 LABEL : Cell Value, String Constant - xvqjAu len=0 
' 0018     27 LABEL : Cell Value, String Constant - xyaEgxrGOXIp len=0 
' 0018     20 LABEL : Cell Value, String Constant - zyrHO 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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