Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 171354d484230995…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:04 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: e7cd764d8ca699f6601b550b2270c817 SHA-1: 1ce112daa689354f3132755e252d6265bc1566c8 SHA-256: 171354d484230995bc8ee0e876e44469a5a0d6d6dfdde126a93b27e393268588
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 sheet containing an Auto_Open function, 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. While the specific payload is not directly visible, the Auto_Open macro itself is the primary indicator of compromise.

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) 6591 bytes
SHA-256: 93f56acbfbec460867918f4041f4e24bd2c28db2090623e6ff794956f8172a49
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VwsdabeAXzM
' 0018     23 LABEL : Cell Value, String Constant - ahGTRgby len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F138 
' 0018     22 LABEL : Cell Value, String Constant - aVmEuCg len=0 
' 0018     20 LABEL : Cell Value, String Constant - BQXhQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - DeeleEgAER len=0 
' 0018     21 LABEL : Cell Value, String Constant - dXyxkZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - EyCkHtEJCaLu len=0 
' 0018     26 LABEL : Cell Value, String Constant - FbfXbrYIfbJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - fJPitLXeew len=0 
' 0018     21 LABEL : Cell Value, String Constant - jjCilM len=0 
' 0018     21 LABEL : Cell Value, String Constant - JnfYVd len=0 
' 0018     25 LABEL : Cell Value, String Constant - kwiJXZuwZO len=0 
' 0018     25 LABEL : Cell Value, String Constant - MaUuslgIRC len=0 
' 0018     23 LABEL : Cell Value, String Constant - MZuFfjEI len=0 
' 0018     23 LABEL : Cell Value, String Constant - NvXYeydk len=0 
' 0018     22 LABEL : Cell Value, String Constant - QKWLjtq len=0 
' 0018     22 LABEL : Cell Value, String Constant - reBuxDE len=0 
' 0018     20 LABEL : Cell Value, String Constant - TzmbN len=0 
' 0018     22 LABEL : Cell Value, String Constant - UPrAYjc len=0 
' 0018     21 LABEL : Cell Value, String Constant - XMezqO len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZBBah 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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