Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fee38a166de35a56…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:48 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: d149d216abe1029fd95cbcaa20b6155e SHA-1: 1c1bd8ab884602064a747f41a20ff85e7afa8b0c SHA-256: fee38a166de35a567a83572da190f43fcf1b6e309fc35772e41dab9dffc663fa
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristic firings. The presence of an Auto_Open defined name suggests that the macro is designed to execute automatically upon opening the workbook. The dangerous formula APIs used in the macro indicate it is intended to perform malicious actions, such as downloading and executing a secondary 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) 6588 bytes
SHA-256: a3dc0eaef55efdbb1f619d61916ac4d27a632a5f160cbf5fd538534aa1bcfde5
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 -  mDXN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C170 
' 0018     22 LABEL : Cell Value, String Constant - EuOlqPJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - geTMWuEVdYlB len=0 
' 0018     20 LABEL : Cell Value, String Constant - GMLpQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - IFmdEh len=0 
' 0018     25 LABEL : Cell Value, String Constant - ifxqqHkbrp len=0 
' 0018     22 LABEL : Cell Value, String Constant - JLGpolu len=0 
' 0018     26 LABEL : Cell Value, String Constant - kcLQLSrsNtJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - KkqhdxBlYWV len=0 
' 0018     26 LABEL : Cell Value, String Constant - KrJQctOzZZO len=0 
' 0018     27 LABEL : Cell Value, String Constant - nJwNdGnZSsvc len=0 
' 0018     25 LABEL : Cell Value, String Constant - sEUEkyJRPz len=0 
' 0018     23 LABEL : Cell Value, String Constant - SWdjJCME len=0 
' 0018     23 LABEL : Cell Value, String Constant - tnyfgWXG len=0 
' 0018     23 LABEL : Cell Value, String Constant - uLhPZOzc len=0 
' 0018     20 LABEL : Cell Value, String Constant - UPFWT len=0 
' 0018     21 LABEL : Cell Value, String Constant - VloOjo len=0 
' 0018     23 LABEL : Cell Value, String Constant - vThAraAB len=0 
' 0018     20 LABEL : Cell Value, String Constant - WvcmI len=0 
' 0018     20 LABEL : Cell Value, String Constant - XQITp len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZepqJSozDv 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 LAB
... (truncated)

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