Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ab3c33b9140f9ac2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:59 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 5bd8458e8fc1fceebfd77d90d82e1491 SHA-1: e178d25d0634e0addd532d5c9b5eb835ad96f6d1 SHA-256: ab3c33b9140f9ac24816c79c6303f9cc5171de8f47a84bb853b9bd1f83659c94
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common technique for executing malicious code upon opening the document. The `RUN` function is explicitly mentioned as a dangerous formula API, suggesting the macro is designed to execute arbitrary commands or download further payloads. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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) 6432 bytes
SHA-256: f4f86b93eee45b1e25c4d53690f4811d5673bf08b82ca4d60844b05ac2b3c6f6
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 -  aZsR
' 0018     25 LABEL : Cell Value, String Constant - ATOKrnllom len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D178 
' 0018     23 LABEL : Cell Value, String Constant - gBBJkabY len=0 
' 0018     25 LABEL : Cell Value, String Constant - gNSOqhjUVO len=0 
' 0018     26 LABEL : Cell Value, String Constant - GYVqpsUgOIt len=0 
' 0018     24 LABEL : Cell Value, String Constant - jcITKHHXS len=0 
' 0018     25 LABEL : Cell Value, String Constant - kDVbVdXPVZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - KkMtutCEezml len=0 
' 0018     21 LABEL : Cell Value, String Constant - LSPGPz len=0 
' 0018     27 LABEL : Cell Value, String Constant - lufUkuJHecRt len=0 
' 0018     25 LABEL : Cell Value, String Constant - NMQWKIZKDb len=0 
' 0018     22 LABEL : Cell Value, String Constant - OGOLBuy len=0 
' 0018     23 LABEL : Cell Value, String Constant - pBFAXKuA len=0 
' 0018     24 LABEL : Cell Value, String Constant - rkwyNXnqH len=0 
' 0018     25 LABEL : Cell Value, String Constant - SaqbsPZEGo len=0 
' 0018     20 LABEL : Cell Value, String Constant - SkWFN len=0 
' 0018     26 LABEL : Cell Value, String Constant - UJIoysKjtzH len=0 
' 0018     22 LABEL : Cell Value, String Constant - UxKySfj len=0 
' 0018     23 LABEL : Cell Value, String Constant - wqpNkbRK len=0 
' 0018     21 LABEL : Cell Value, String Constant - xdIbwv len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZhFpRddd 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
' 00f
... (truncated)

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