Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a005c6378ccaa94…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:39 Authoring application: Microsoft Excel First seen: 2021-09-29
MD5: e6908db18ff4faa476cb71b3639f07fa SHA-1: fe84aebd98616f9d717ba576ddb241ee9f19e46b SHA-256: 2a005c6378ccaa94b8425f5443a5ce30162260e82fa19d7213f6c35756daab9d
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 critical finding. This indicates the macro will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely to download and execute a second-stage payload. No specific family could be identified.

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) 6662 bytes
SHA-256: 5d818240d89e5445341f4f3eacdb4d1670d8022afeceaa2fb05e27ffeabddb3a
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 -  xoXb
' 0018     26 LABEL : Cell Value, String Constant - AOQygMGXSuB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D157 
' 0018     20 LABEL : Cell Value, String Constant - cBmzi len=0 
' 0018     25 LABEL : Cell Value, String Constant - CZDNpHHCVl len=0 
' 0018     24 LABEL : Cell Value, String Constant - ejurRpSAG len=0 
' 0018     26 LABEL : Cell Value, String Constant - ELOSuXrqTqC len=0 
' 0018     27 LABEL : Cell Value, String Constant - GBOVXuGREKPX len=0 
' 0018     22 LABEL : Cell Value, String Constant - jbzFKon len=0 
' 0018     23 LABEL : Cell Value, String Constant - jwkdVetk len=0 
' 0018     20 LABEL : Cell Value, String Constant - KqyyV len=0 
' 0018     27 LABEL : Cell Value, String Constant - mbScHUnmDfRJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - mfwwNeq len=0 
' 0018     23 LABEL : Cell Value, String Constant - MjJlUmtN len=0 
' 0018     26 LABEL : Cell Value, String Constant - MqThXaOQMFS len=0 
' 0018     21 LABEL : Cell Value, String Constant - MSvdOC len=0 
' 0018     25 LABEL : Cell Value, String Constant - nDeivGMYOq len=0 
' 0018     22 LABEL : Cell Value, String Constant - pCKApcU len=0 
' 0018     20 LABEL : Cell Value, String Constant - ReTbC len=0 
' 0018     26 LABEL : Cell Value, String Constant - srEoYuEisxn len=0 
' 0018     27 LABEL : Cell Value, String Constant - vTmIfNVuTiKD len=0 
' 0018     23 LABEL : Cell Value, String Constant - xVDXeLMT 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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