Malicious RTF — malware analysis report

Static analysis result for SHA-256 9f3aeec106626f81…

MALICIOUS

RTF

817.1 KB Created: 2018-03-21 18:51:00 First seen: 2018-03-30
MD5: c02de7d699bf1402f66ab86d58dc9df2 SHA-1: 42f783e351132aab7e2415f94822424cc948c01c SHA-256: 9f3aeec106626f814b7b7adb148644cf1351ad65f55363e8926e269c9d374227
262 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary payload.

Heuristics 6

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • ClamAV: Xls.Downloader.Generic-6750544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6750544-0
  • \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 10 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002ce6.bin rtf-objdata-decoded RTF \objdata at offset 0x2CE6 27195 bytes
SHA-256: b5b5bed5341033166c5e88d984864806d896d2f90480414e39724a27359bb75a
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off0001637f.bin rtf-objdata-decoded RTF \objdata at offset 0x1637F 27195 bytes
SHA-256: 596f4f63920b2f45f19414a8dc8e6762b354e5a1336d69f3af382d0501b9907a
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_02_off000299fa.bin rtf-objdata-decoded RTF \objdata at offset 0x299FA 27195 bytes
SHA-256: 498dcf7c3d2011744c60ed5a1bacd8bae1c14d71b63cb71ec3b40a20171bca5e
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003d075.bin rtf-objdata-decoded RTF \objdata at offset 0x3D075 27195 bytes
SHA-256: a875bfa8ebf989cc219471de6209364cc69f235318df05fbffc7a95ec08a18c9
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_04_off000506f0.bin rtf-objdata-decoded RTF \objdata at offset 0x506F0 27195 bytes
SHA-256: 3da2ce9ba8bafb2a8d606076c2499064f87cce52bec85fed03756ee20b6acda0
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00063dc4.bin rtf-objdata-decoded RTF \objdata at offset 0x63DC4 27195 bytes
SHA-256: 637bb0ea960a553d0e11c688c194bb2de330ee92efd941878663453cfc1f19ba
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_06_off0007745d.bin rtf-objdata-decoded RTF \objdata at offset 0x7745D 27195 bytes
SHA-256: 59440c022a95b690fcff94d1b23764ac1822b90dae93d150a4459a56b2029017
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008aad8.bin rtf-objdata-decoded RTF \objdata at offset 0x8AAD8 27195 bytes
SHA-256: cfc3688a892f95eed5c164d7f552b55ecfe91740917dce33f7c8a3b7e2c45996
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_08_off0009e153.bin rtf-objdata-decoded RTF \objdata at offset 0x9E153 27195 bytes
SHA-256: 5b743a9cde9bb5811243ce75a2aaac0a1a1c083bdc6655a39c103ac8d60a0e8b
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000b17ce.bin rtf-objdata-decoded RTF \objdata at offset 0xB17CE 27195 bytes
SHA-256: 2de81d5f4528104d4500d0580be03371f4a48440df777667f4c1e2caf37a0b64
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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