Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e00ed705e035e39…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:20 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: 08f5916dcc135157bc16fabe930bd7a2 SHA-1: b8d232b686adca5d5ba6ca2db5c7110221564ffb SHA-256: 7e00ed705e035e39183eefdaecdd196ed739dd4a3c7fa2ef65829380701887c3
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 defined name, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains formulas that are flagged as dangerous, suggesting it attempts to run arbitrary commands.

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) 6694 bytes
SHA-256: 0cc7abf01851c6712f9dff542b5d2844c0af338d9944c24bd6381e07e003f598
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 -  cMzKMX
' 0018     23 LABEL : Cell Value, String Constant - aRCYaZXP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F150 
' 0018     20 LABEL : Cell Value, String Constant - bznIw len=0 
' 0018     20 LABEL : Cell Value, String Constant - djLel len=0 
' 0018     25 LABEL : Cell Value, String Constant - DxNFDHHLJw len=0 
' 0018     22 LABEL : Cell Value, String Constant - EdoxDnm len=0 
' 0018     24 LABEL : Cell Value, String Constant - eITlPINbs len=0 
' 0018     26 LABEL : Cell Value, String Constant - esIVWEMljvv len=0 
' 0018     27 LABEL : Cell Value, String Constant - ETcEdPHRJRqh len=0 
' 0018     20 LABEL : Cell Value, String Constant - GRPfH len=0 
' 0018     24 LABEL : Cell Value, String Constant - iBMLpxITm len=0 
' 0018     22 LABEL : Cell Value, String Constant - JVLTOgT len=0 
' 0018     23 LABEL : Cell Value, String Constant - knZYUZtt len=0 
' 0018     20 LABEL : Cell Value, String Constant - MeFzY len=0 
' 0018     20 LABEL : Cell Value, String Constant - MzYgL len=0 
' 0018     24 LABEL : Cell Value, String Constant - ToufKdoIw len=0 
' 0018     25 LABEL : Cell Value, String Constant - urUfzZQRyu len=0 
' 0018     27 LABEL : Cell Value, String Constant - VKYXGyIkrXoi len=0 
' 0018     21 LABEL : Cell Value, String Constant - Wkmknx len=0 
' 0018     22 LABEL : Cell Value, String Constant - xDIvWgz len=0 
' 0018     27 LABEL : Cell Value, String Constant - xPuVKdtCLiVy 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 LABE
... (truncated)

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