Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0b52f459efd8d1de…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:33:12 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: be6eb7f918fec07c1eb759a6297ff791 SHA-1: 3cce214f7ad8b4d27e0b699645294220dfa76f35 SHA-256: 0b52f459efd8d1de48343b9ea965630f7d621c962c8344be8173c8b934d1dc04
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 containing an Auto_Open macro. This macro is designed to execute arbitrary code, indicated by the use of dangerous formula APIs like RUN. The primary function of this macro is to serve as a downloader for a secondary payload, although the specific URL or execution details are not directly extractable from the provided evidence.

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) 6421 bytes
SHA-256: 653e0c2dff403e0f6481276a142cdf7f0b3de444e7e179db7143f165d462bb90
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GcU
' 0018     25 LABEL : Cell Value, String Constant - aMADHHUwuu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G166 
' 0018     20 LABEL : Cell Value, String Constant - cDvmS len=0 
' 0018     26 LABEL : Cell Value, String Constant - DDUnlNvJtYW len=0 
' 0018     27 LABEL : Cell Value, String Constant - DzorSyyCzcvX len=0 
' 0018     24 LABEL : Cell Value, String Constant - GdkxyHMwU len=0 
' 0018     24 LABEL : Cell Value, String Constant - kBpqnJbSQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - kWcmjMIEDwzm len=0 
' 0018     27 LABEL : Cell Value, String Constant - PwHFnxNlyylf len=0 
' 0018     20 LABEL : Cell Value, String Constant - qJaPG len=0 
' 0018     24 LABEL : Cell Value, String Constant - SdfCNqsQJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - sxVXKGEgaZEz len=0 
' 0018     22 LABEL : Cell Value, String Constant - TeCGflg len=0 
' 0018     22 LABEL : Cell Value, String Constant - TJwYnDm len=0 
' 0018     21 LABEL : Cell Value, String Constant - UOEAVi len=0 
' 0018     23 LABEL : Cell Value, String Constant - uPiRdXFR len=0 
' 0018     21 LABEL : Cell Value, String Constant - VhKzsZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - vxMcHDtmweRz len=0 
' 0018     26 LABEL : Cell Value, String Constant - XPUEJBfNBbV len=0 
' 0018     23 LABEL : Cell Value, String Constant - XRZvVfAH len=0 
' 0018     25 LABEL : Cell Value, String Constant - zvahbBQzOX 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
' 
... (truncated)

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