Win.Trojan.Kallisti-1 — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 c3b412b22bfebc7b…

MALICIOUS

Office (OLE) / .DOC

37.0 KB Created: 2002-05-13 16:14:00 Authoring application: Microsoft Word 9.0
MD5: 0b6d3ba97c607d4c334e45fda1907912 SHA-1: 826552b0aa5837a1c4c205d8c980d103deaafc01 SHA-256: c3b412b22bfebc7b5b3193ce249e51c1cc42f78e486cb88e604a7ff59da805df
308 Risk Score

Malware Insights

Win.Trojan.Kallisti-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains a malicious VBA macro with an AutoOpen subroutine, which is a common technique for initial execution. The script uses CreateObject to call Windows API functions such as Sleep, CopyFile, and CreateDirectory. It copies the current document to '%windir%\ApiSystem\HelloU.doc' and then calls other subroutines like 'endprotect', 'infdoc', 'SrchF', and 'PayLoad', suggesting a multi-stage infection process. The ClamAV detection of 'Win.Trojan.Kallisti-1' and 'Win.Trojan.C-286' on an extracted artifact strongly indicates a trojan.

Heuristics 8

  • ClamAV: Win.Trojan.Kallisti-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Kallisti-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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2f75067804310f0c137102d2cd1d50ec8123670b65f6afcbe5ae4d0f80b3a231		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4913 bytes
Detection
ClamAV: Win.Trojan.C-286
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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