Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 066e478d9fe7de53…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:23 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 987fd91117a81cc7f1c04d89f82e1995 SHA-1: 1ca20177f112d6f2d947e95c88bafbf660c0b29c SHA-256: 066e478d9fe7de53a310e73d63a1e6e5a9b86aa00a3586806e33add8e3936e55
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 technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands, likely to download and run a second-stage payload.

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) 6595 bytes
SHA-256: 1b8a2ace0bec0534843b8295c21a695aa317a9a2f5523bdfffcc7c7560dbd095
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 -  zOfrZBiW
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H163 
' 0018     20 LABEL : Cell Value, String Constant - bswjD len=0 
' 0018     26 LABEL : Cell Value, String Constant - ciyrnIwkLSE len=0 
' 0018     20 LABEL : Cell Value, String Constant - fdVfe len=0 
' 0018     24 LABEL : Cell Value, String Constant - fRYXxYYVI len=0 
' 0018     23 LABEL : Cell Value, String Constant - GLsipggi len=0 
' 0018     23 LABEL : Cell Value, String Constant - hpIsJCfu len=0 
' 0018     24 LABEL : Cell Value, String Constant - IzPrwkNQY len=0 
' 0018     20 LABEL : Cell Value, String Constant - KVVVz len=0 
' 0018     20 LABEL : Cell Value, String Constant - lkYUQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - nzNITXxxesa len=0 
' 0018     24 LABEL : Cell Value, String Constant - PHAJmeRYY len=0 
' 0018     24 LABEL : Cell Value, String Constant - QivsfdKxz len=0 
' 0018     27 LABEL : Cell Value, String Constant - QYgbVvJxyBcy len=0 
' 0018     22 LABEL : Cell Value, String Constant - qzIKIsW len=0 
' 0018     21 LABEL : Cell Value, String Constant - rLcric len=0 
' 0018     25 LABEL : Cell Value, String Constant - SsnGzYSmkj len=0 
' 0018     27 LABEL : Cell Value, String Constant - tbkoAMNWqUvx len=0 
' 0018     25 LABEL : Cell Value, String Constant - tUOxkeHYqd len=0 
' 0018     24 LABEL : Cell Value, String Constant - TZrYtFWAA len=0 
' 0018     20 LABEL : Cell Value, String Constant - YwpGt 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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