Doc.Trojan.Shiver-1 — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 29885baee6620514…

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 1996-10-14 23:33:28 Authoring application: Microsoft Excel
MD5: 52afb5c11bb9882897aab1075fc62e22 SHA-1: bd797d8cd75fd61e30626765af79c3350a445225 SHA-256: 29885baee6620514af195fd7e7978852d079aadfb6f25eedb680e6e662b58078
400 Risk Score

Malware Insights

Doc.Trojan.Shiver-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel document containing a large VBA macro. Heuristics indicate the presence of AutoOpen and Auto_Open macros, along with a critical Shell() call and VBA p-code execution. ClamAV signatures identify it as Doc.Trojan.Shiver-1. The VBA script appears to be designed to execute arbitrary code, likely for downloading and executing a secondary payload, as suggested by the Shell() call and the presence of an embedded macro file.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Shiver-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Shiver-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
557a225a9eac257d02c58e756be19b757dae0b0913d3700b8a6a6a0b9163865e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 34959 bytes
Detection
ClamAV: Doc.Trojan.Shiver-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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