Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 afe8ed0448a9f8c6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:53 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: b5c75beeadd57d89b94859c78d1b867b SHA-1: 79845d2f124d865797ce701c0221494de2321cbe SHA-256: afe8ed0448a9f8c67841b2de42dc0612792fc4f39fff2d7c7caa0ccb77fe4522
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 indicating automatic execution upon opening. The macros utilize dangerous formula APIs, including 'RUN', suggesting an attempt to execute arbitrary code. This pattern is commonly used to download and execute further malicious content.

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) 6384 bytes
SHA-256: b539ed7452f6d6618aaeec6373ed0f0f53b56b7b4382980859ecb4b6aa9c39cb
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 -  UjMN
' 0018     26 LABEL : Cell Value, String Constant - aIEgQgkAvno len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C182 
' 0018     25 LABEL : Cell Value, String Constant - befLHZAYza len=0 
' 0018     26 LABEL : Cell Value, String Constant - BtEjXVslzAS len=0 
' 0018     25 LABEL : Cell Value, String Constant - EVJuoyBuUq len=0 
' 0018     21 LABEL : Cell Value, String Constant - GrDydg len=0 
' 0018     21 LABEL : Cell Value, String Constant - GuzYgz len=0 
' 0018     22 LABEL : Cell Value, String Constant - HMmIxIh len=0 
' 0018     22 LABEL : Cell Value, String Constant - iNkigZx len=0 
' 0018     23 LABEL : Cell Value, String Constant - IuoYCTpC len=0 
' 0018     21 LABEL : Cell Value, String Constant - iYNkKr len=0 
' 0018     27 LABEL : Cell Value, String Constant - JluApHIVjpHv len=0 
' 0018     20 LABEL : Cell Value, String Constant - KWpnw len=0 
' 0018     23 LABEL : Cell Value, String Constant - MgZeiUIs len=0 
' 0018     27 LABEL : Cell Value, String Constant - mKBBEsYArxja len=0 
' 0018     25 LABEL : Cell Value, String Constant - OoZDlPjRjo len=0 
' 0018     27 LABEL : Cell Value, String Constant - PiRlcYvemzSH len=0 
' 0018     20 LABEL : Cell Value, String Constant - QsvDY len=0 
' 0018     22 LABEL : Cell Value, String Constant - rmDnkpi len=0 
' 0018     22 LABEL : Cell Value, String Constant - yMNeyTT len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZmklhW 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 LA
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.