Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0c133ce54209a8d9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:06 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: 5b30e4177eda79d013cff01c3825cbd5 SHA-1: f4db6b48f8c77a0b5a8ea2bc88858e2eee4a4ebf SHA-256: 0c133ce54209a8d993b49ad44f943868a33bcb5698adaf0add02011487f65261
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. Static analysis detected an Auto_Open function within the XLM macros, which is a common technique for executing malicious code upon opening the document. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute commands, likely to download and execute 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) 6473 bytes
SHA-256: a9b408e02da48c50d56a69ee1009f444b8ff5b931f0e45b7beed51d7a970ab2d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Fqitr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F189 
' 0018     27 LABEL : Cell Value, String Constant - BKIHZHLfbwEV len=0 
' 0018     24 LABEL : Cell Value, String Constant - cfFFFSGjY len=0 
' 0018     26 LABEL : Cell Value, String Constant - EmbmBsXOoMp len=0 
' 0018     23 LABEL : Cell Value, String Constant - gtuWzHKA len=0 
' 0018     22 LABEL : Cell Value, String Constant - hBpRqGY len=0 
' 0018     22 LABEL : Cell Value, String Constant - hPFoUfU len=0 
' 0018     27 LABEL : Cell Value, String Constant - IbdQKIvsbceM len=0 
' 0018     21 LABEL : Cell Value, String Constant - ifxyds len=0 
' 0018     24 LABEL : Cell Value, String Constant - LoNszIZdi len=0 
' 0018     25 LABEL : Cell Value, String Constant - LxYQNksJcB len=0 
' 0018     21 LABEL : Cell Value, String Constant - mUQxwD len=0 
' 0018     21 LABEL : Cell Value, String Constant - nWIhni len=0 
' 0018     26 LABEL : Cell Value, String Constant - oAPaNYUmxpD len=0 
' 0018     25 LABEL : Cell Value, String Constant - PAVDCWKBQb len=0 
' 0018     20 LABEL : Cell Value, String Constant - Rsime len=0 
' 0018     26 LABEL : Cell Value, String Constant - sgzIGYWYkLs len=0 
' 0018     26 LABEL : Cell Value, String Constant - STGKgyHHJHg len=0 
' 0018     23 LABEL : Cell Value, String Constant - wiFWebDh len=0 
' 0018     22 LABEL : Cell Value, String Constant - XrJlcQL len=0 
' 0018     23 LABEL : Cell Value, String Constant - zpycOnMg 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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