Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 852c88aab5419c3b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:56 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: fa9e75befc467d38407eb00e211f6e19 SHA-1: 828865ab378aa398ec97436f6c53c481efb80ad1 SHA-256: 852c88aab5419c3bd13961e606bf8a5cbd456e7d65aad93eef7ca7e605915b2f
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 function, which is a known technique for executing malicious code upon opening the document. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. While no specific URLs or hashes were extracted, the macro's execution capability is the primary threat.

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) 6468 bytes
SHA-256: f75d097620468e59e95c11efe2513c9fa0c2defbaf8ecbf9fea5c26624cda0c2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GxtyoWm
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H131 
' 0018     20 LABEL : Cell Value, String Constant - BgNiq len=0 
' 0018     23 LABEL : Cell Value, String Constant - bHPxnUWK len=0 
' 0018     23 LABEL : Cell Value, String Constant - FHRtEOyR len=0 
' 0018     22 LABEL : Cell Value, String Constant - kbjYQTu len=0 
' 0018     20 LABEL : Cell Value, String Constant - MUiKE len=0 
' 0018     20 LABEL : Cell Value, String Constant - MuJDF len=0 
' 0018     23 LABEL : Cell Value, String Constant - nbyHsBLs len=0 
' 0018     24 LABEL : Cell Value, String Constant - ohWYeHKQn len=0 
' 0018     24 LABEL : Cell Value, String Constant - OlVbWMyTP len=0 
' 0018     26 LABEL : Cell Value, String Constant - OQYozbktjla len=0 
' 0018     23 LABEL : Cell Value, String Constant - QDPAxLnU len=0 
' 0018     21 LABEL : Cell Value, String Constant - RtHrEK len=0 
' 0018     26 LABEL : Cell Value, String Constant - szoeVCmhnqj len=0 
' 0018     27 LABEL : Cell Value, String Constant - TGzLfnuYsuJX len=0 
' 0018     22 LABEL : Cell Value, String Constant - TNKdEHO len=0 
' 0018     23 LABEL : Cell Value, String Constant - uUPUhnIy len=0 
' 0018     22 LABEL : Cell Value, String Constant - UVhTEPN len=0 
' 0018     26 LABEL : Cell Value, String Constant - veHfvuqtuQN len=0 
' 0018     20 LABEL : Cell Value, String Constant - WbvNy len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZjBjtIWO 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 LABELSS
... (truncated)

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