Rtf.Dropper.Agent — RTF malware analysis

Static analysis result for SHA-256 5358409f1cba4984…

MALICIOUS

RTF

42.9 KB First seen: 2019-08-04
MD5: a5eb1885907e90c215438ae7193edf06 SHA-1: 1c50d8494c75e238863a7331d311e69c384fc3bf SHA-256: 5358409f1cba4984917b16eda3db5d2491b9280da8c0578c06383564a004394f
202 Risk Score

Malware Insights

Rtf.Dropper.Agent · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability and OLE object activation. ClamAV identifies the file as Rtf.Dropper.Agent, indicating its purpose is to drop and execute a secondary payload. The embedded artifact objdata_00_off0000a150.bin is likely the dropped payload.

Heuristics 6

  • Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • ClamAV: Rtf.Dropper.Agent-7120836-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7120836-0
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Suspicious extracted artifact medium 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000a150.bin rtf-objdata-decoded RTF \objdata at offset 0xA150 1316 bytes
SHA-256: b17c8bc5c6ceff38e0b80b3d0a254507085165189c256bd721b26f3eeec81089
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_STR_LOADLIBRARY, SC_STR_URLDOWNLOAD, SC_PEB_ACCESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress, URLDownloadToFileW, ExitProcess, ShellExecuteW

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