Malicious RTF — malware analysis report

Static analysis result for SHA-256 ee6d534a4ac67793…

MALICIOUS

RTF

918.5 KB Created: 2018-05-10 15:40:00 First seen: 2019-11-20
MD5: a81113c068032881f33c719e44df20bd SHA-1: 5d49c7d83842a691b9ca92f9f4d92806e941f2b8 SHA-256: ee6d534a4ac677932e70ccff3945a2c423215d5313307cb9241bb66001b03247
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: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • \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_off00002c17.bin rtf-objdata-decoded RTF \objdata at offset 0x2C17 33339 bytes
SHA-256: 65a0b5c6bc4c1fa248bbe774f7458b1f9a151578be2a401753ecf5857147cecd
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b2f.bin rtf-objdata-decoded RTF \objdata at offset 0x18B2F 33339 bytes
SHA-256: a202dc1335a91c6082344d2b3e445dddc974d089bac0e8b65e157d6a931e55ab
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea47.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA47 33339 bytes
SHA-256: aceec547be5d5a8a5942ac7bc0daaa3f79abc5cda5475cbb967fbaacd159d186
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off0004495f.bin rtf-objdata-decoded RTF \objdata at offset 0x4495F 33339 bytes
SHA-256: a670db1fe5d67fb421d790b17c80f1d5f5951401ea44249a314f19c1b14f758b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a877.bin rtf-objdata-decoded RTF \objdata at offset 0x5A877 33339 bytes
SHA-256: d1547de8cac3ff0ff94d2a22833828218a3dfe4726ef3ad3fcb578d422b1c558
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707d9.bin rtf-objdata-decoded RTF \objdata at offset 0x707D9 33339 bytes
SHA-256: 02d01648c4d1d121ff7a3d51a9331a221fd94a97652dccad9097a40d30101ee8
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000866f1.bin rtf-objdata-decoded RTF \objdata at offset 0x866F1 33339 bytes
SHA-256: d0ab915648be077325e2e3e638864b92a3dd19eaa5fe32e33ffb739d9b4bdad4
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c609.bin rtf-objdata-decoded RTF \objdata at offset 0x9C609 33339 bytes
SHA-256: 238ec6e2e5a9603a984b6238e127211be662840ffcb12594bf743273bf1b670b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b2521.bin rtf-objdata-decoded RTF \objdata at offset 0xB2521 33339 bytes
SHA-256: 2d0d919ceb14cb28fd000d5262897f0f8c120abb22890e0125b0d4782b8ae456
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c8439.bin rtf-objdata-decoded RTF \objdata at offset 0xC8439 33339 bytes
SHA-256: c35cb07e1d61befa4120c5a1b8efbe45e2a2e241cdc5f587c9c68b8eefd2c54d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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