Malicious RTF — malware analysis report

Static analysis result for SHA-256 99b317f29a7f3e36…

MALICIOUS

RTF

3.65 MB First seen: 2026-06-09
MD5: a3dbc4ebd0507686503a2643a92f21ff SHA-1: cf6ccb24e02749331f5827104d36632c44c06c33 SHA-256: 99b317f29a7f3e360b69335929b166f8f4929cdfdb519447ad7ff6562420fdc5
180 Risk Score

Heuristics 5

  • 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.
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000a967c.bin rtf-objdata-decoded RTF \objdata at offset 0xA967C 194747 bytes
SHA-256: 2538254dc155e224acbbffa85932880847dcd5da8332453acc5d7271b2e5ee72
objdata_01_off0011376f.bin rtf-objdata-decoded RTF \objdata at offset 0x11376F 694854 bytes
SHA-256: 3d023ce1c0575dbc6c3ca8c9e72ec9cc3e28d488804a33d93a5d75b52a745e89
rtf_svb_0038da85.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x38DA85 967 bytes
SHA-256: b461da4154fae7bb965448788af03a71a043eb99efb0e1486728dba51d84fefb
rtf_svb_0038ea29.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x38EA29 964 bytes
SHA-256: fd1e102bcb6b99544d5f496230f01cdc210d50001dfd8788c72c164a41bbc17a
rtf_svb_0038fb0c.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x38FB0C 962 bytes
SHA-256: dccebec6ff30f32dea492b008c7a93c18ee44b84efc33f5170556a0e447c561b
rtf_svb_00390d51.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x390D51 964 bytes
SHA-256: 65de83f9da1995ceca4030d239f160f1147ba8bc65cff69e56d96e1036f8a1f4
rtf_svb_00391dbe.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x391DBE 964 bytes
SHA-256: 39f288b305c47c2fd0fd8bd70152a78751d03b94e58ef4697d97c379caca4dee
rtf_svb_00392874.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x392874 962 bytes
SHA-256: 23b49ebcf55d2f54277e67ed137a0426cb9515e6c8114b1839bfd2e0b780ce39
rtf_svb_003942ac.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x3942AC 966 bytes
SHA-256: c9a120b53568a6dad7025751988d0b74512060f8a13d1eb00a0bd65499d61adf
rtf_svb_00395d4b.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x395D4B 965 bytes
SHA-256: 82c8d8674a89c4d2c1e4fd0de8103680307b4b4228464f322ce03570939e979c

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