Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d295145492522f3f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:32:51 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 68aeb64e438029d4e4e9871515c71927 SHA-1: e322930273998c1dd640f806406d1bebba7964bf SHA-256: d295145492522f3f62348e5681edf5ca268865b477be7324c0612bbbf5866237
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 strongly suggests the macro is designed to execute arbitrary code, likely a downloader for a second-stage payload. No specific family could be identified from the available 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) 6467 bytes
SHA-256: 1744a32f33a9f7081720bd692ec233b8dd721526b475af0be9dc8d6d83e419a4
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mhPg
' 0018     27 LABEL : Cell Value, String Constant - aPUMYkyDBfUv len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B158 
' 0018     20 LABEL : Cell Value, String Constant - bBrVN len=0 
' 0018     20 LABEL : Cell Value, String Constant - cICVQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - EBJVdcRlUWS len=0 
' 0018     26 LABEL : Cell Value, String Constant - fdSPyYUyVXQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - JRwJGtC len=0 
' 0018     20 LABEL : Cell Value, String Constant - pimtN len=0 
' 0018     24 LABEL : Cell Value, String Constant - PzmTwCwYI len=0 
' 0018     21 LABEL : Cell Value, String Constant - QrnoFT len=0 
' 0018     25 LABEL : Cell Value, String Constant - RepSoVGqPq len=0 
' 0018     26 LABEL : Cell Value, String Constant - RqUkKDmoUvO len=0 
' 0018     21 LABEL : Cell Value, String Constant - RUXasL len=0 
' 0018     20 LABEL : Cell Value, String Constant - SklHC len=0 
' 0018     26 LABEL : Cell Value, String Constant - TIJIduhRJAy len=0 
' 0018     21 LABEL : Cell Value, String Constant - TZEKBf len=0 
' 0018     21 LABEL : Cell Value, String Constant - uJDnQK len=0 
' 0018     26 LABEL : Cell Value, String Constant - wyZQfndDqfc len=0 
' 0018     27 LABEL : Cell Value, String Constant - YbdsHZvNlwwi len=0 
' 0018     27 LABEL : Cell Value, String Constant - YIXDdTinwuyV len=0 
' 0018     22 LABEL : Cell Value, String Constant - zbbzYMm 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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