Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7c0dfd5ffd14cea…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:48 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: ec3482dd44ee573cc6ca7b4a44ccc279 SHA-1: 23d0535d673f26e9a6f871479477e1977ddc9f7d SHA-256: e7c0dfd5ffd14ceade1603493d3d24c61dacc2e5b37b6df082503f27f3fa32e8
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-enabled workbook. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code, likely a downloader for a secondary payload. No specific family could be identified.

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) 6589 bytes
SHA-256: 4d9571110ffee00d047cce2476970d7f25fa6cb545df60a161a3ec136a7ed797
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 -  xjkdWliTep
' 0018     26 LABEL : Cell Value, String Constant - apJCkmcQxdd len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G142 
' 0018     24 LABEL : Cell Value, String Constant - BQbysRPTW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ckXwemSbBc len=0 
' 0018     21 LABEL : Cell Value, String Constant - fgfGgA len=0 
' 0018     22 LABEL : Cell Value, String Constant - KElKOgZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - KTFMHYN len=0 
' 0018     21 LABEL : Cell Value, String Constant - ldKBBz len=0 
' 0018     20 LABEL : Cell Value, String Constant - oyWtC len=0 
' 0018     22 LABEL : Cell Value, String Constant - paZxdiR len=0 
' 0018     22 LABEL : Cell Value, String Constant - QCaICyD len=0 
' 0018     24 LABEL : Cell Value, String Constant - qxwACrBeK len=0 
' 0018     27 LABEL : Cell Value, String Constant - rOfJZMejnsKL len=0 
' 0018     25 LABEL : Cell Value, String Constant - upgNJZxdzj len=0 
' 0018     24 LABEL : Cell Value, String Constant - vLxjwmtSY len=0 
' 0018     24 LABEL : Cell Value, String Constant - wOoSWHfsv len=0 
' 0018     20 LABEL : Cell Value, String Constant - wpVgP len=0 
' 0018     23 LABEL : Cell Value, String Constant - XqWVEnqQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - yomrBnDZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - zcpaNenyt len=0 
' 0018     23 LABEL : Cell Value, String Constant - zoRmMlmW 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 
... (truncated)

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