Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 68be4ea2f75f2291…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:07 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 573bcd9b78e6a3eee19493e65c050490 SHA-1: c1467a016b8f403bd56e39b90fdd0453e01796c3 SHA-256: 68be4ea2f75f229153e70d3c0941f831eded410e1b63b01906badc57adb2ac3a
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 known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary commands. No specific family could be identified, but the technique is common for initial execution.

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) 6645 bytes
SHA-256: eae1fe7baa9eaca2801138a8245a1c4ed197783f349c474a8917f22fa442157f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KbjSYVYn
' 0018     21 LABEL : Cell Value, String Constant - AdpQhU len=0 
' 0018     26 LABEL : Cell Value, String Constant - atFSYYvNlIq len=0 
' 0018     25 LABEL : Cell Value, String Constant - AuDwonJfUF len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E165 
' 0018     26 LABEL : Cell Value, String Constant - bBGayNlKbaL len=0 
' 0018     20 LABEL : Cell Value, String Constant - BXwSh len=0 
' 0018     22 LABEL : Cell Value, String Constant - DknepaF len=0 
' 0018     24 LABEL : Cell Value, String Constant - ExUcTNDhg len=0 
' 0018     23 LABEL : Cell Value, String Constant - fOWwYxOs len=0 
' 0018     22 LABEL : Cell Value, String Constant - frFznOi len=0 
' 0018     21 LABEL : Cell Value, String Constant - GFajSO len=0 
' 0018     22 LABEL : Cell Value, String Constant - HPrUEKD len=0 
' 0018     25 LABEL : Cell Value, String Constant - hWTGFOMwvR len=0 
' 0018     26 LABEL : Cell Value, String Constant - IeOICDuSSzk len=0 
' 0018     25 LABEL : Cell Value, String Constant - iQTVoPdnAL len=0 
' 0018     23 LABEL : Cell Value, String Constant - lBKxDUvC len=0 
' 0018     25 LABEL : Cell Value, String Constant - OmDlFmJXdQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - tdVPpEWtiFHA len=0 
' 0018     23 LABEL : Cell Value, String Constant - UnqFcdeg len=0 
' 0018     20 LABEL : Cell Value, String Constant - VVmQV len=0 
' 0018     20 LABEL : Cell Value, String Constant - Ztwps 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     1
... (truncated)

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