Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f0df04868b6152aa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:34 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: ba2565d551f3088201b73479d69818f4 SHA-1: 076be6780d962051f5aba686de58f8c846a49bb2 SHA-256: f0df04868b6152aa6efbff7dcfa77d5557d42560a41110a5a77e49491482f9fa
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. This technique is commonly used to download and execute further stages of malware.

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) 6611 bytes
SHA-256: 0b41ab4fcbcb01b3084cc74f852825274e4ce519fe998b489859f1792ca46281
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 -  JhHNoKLl
' 0018     26 LABEL : Cell Value, String Constant - Atmabnchhmo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F151 
' 0018     21 LABEL : Cell Value, String Constant - cpPnpc len=0 
' 0018     24 LABEL : Cell Value, String Constant - DJtaNBLVd len=0 
' 0018     22 LABEL : Cell Value, String Constant - DUjehTj len=0 
' 0018     24 LABEL : Cell Value, String Constant - ehznzWRIu len=0 
' 0018     21 LABEL : Cell Value, String Constant - Gfwchu len=0 
' 0018     26 LABEL : Cell Value, String Constant - gNRLicZdwON len=0 
' 0018     24 LABEL : Cell Value, String Constant - jQZfmQwhr len=0 
' 0018     23 LABEL : Cell Value, String Constant - JrTGjTIz len=0 
' 0018     26 LABEL : Cell Value, String Constant - jTWseZoFIQK len=0 
' 0018     20 LABEL : Cell Value, String Constant - kPplE len=0 
' 0018     27 LABEL : Cell Value, String Constant - LwxrfwLcwFXq len=0 
' 0018     27 LABEL : Cell Value, String Constant - OhXtMgqKdwRp len=0 
' 0018     22 LABEL : Cell Value, String Constant - pTRTJgJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - PyFyNJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - rfyRaQixNo len=0 
' 0018     20 LABEL : Cell Value, String Constant - uXFRj len=0 
' 0018     22 LABEL : Cell Value, String Constant - VcEBKuO len=0 
' 0018     26 LABEL : Cell Value, String Constant - WDbeUrrrSFs len=0 
' 0018     24 LABEL : Cell Value, String Constant - YWdhBRMGE 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 
... (truncated)

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