Malicious RTF — malware analysis report

Static analysis result for SHA-256 a1191e7f6f34fa0d…

MALICIOUS

RTF

918.5 KB Created: 2018-05-07 02:33:00 First seen: 2018-07-14
MD5: 970bc40c111a1628c95c85b9c81c5ee0 SHA-1: 6631d779957cb450a6aa329df2a32cf8db1ed345 SHA-256: a1191e7f6f34fa0dd7b0c5582e31f3d0b4db4a8fbef9229e615ea4052d4b3de8
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_off00002c15.bin rtf-objdata-decoded RTF \objdata at offset 0x2C15 33339 bytes
SHA-256: 0a72001796dd5dd88ed76934dcbf347dcb1a2b210b531393200d283e7a8c8116
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b2d.bin rtf-objdata-decoded RTF \objdata at offset 0x18B2D 33339 bytes
SHA-256: bf162021a5a8b628a73ec7f1e6f39002757064d699e4ab5aae145de2f8fc5c35
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea45.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA45 33339 bytes
SHA-256: 188b2cb1a83edf65064727728dbd1286883cb21decc8fc3233610ecea7c226cf
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off0004495d.bin rtf-objdata-decoded RTF \objdata at offset 0x4495D 33339 bytes
SHA-256: b535b5c25d34368a6020010511597bde54dc3e149396c1088be860c95142313f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a875.bin rtf-objdata-decoded RTF \objdata at offset 0x5A875 33339 bytes
SHA-256: 681cd9be1e64727b5e15c922b404fa144c65b5397adcb96425a8f27e1fa54bd8
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707d7.bin rtf-objdata-decoded RTF \objdata at offset 0x707D7 33339 bytes
SHA-256: 3ea4e4496dd4f87588f04f36227d0f4b1ac5184c57389bf62c41016194305352
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000866ef.bin rtf-objdata-decoded RTF \objdata at offset 0x866EF 33339 bytes
SHA-256: 702a7596bdf3a585b6324df0290bc995deab49460465bf2ed56621567b367abc
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c607.bin rtf-objdata-decoded RTF \objdata at offset 0x9C607 33339 bytes
SHA-256: a7217f99a50f61bc7db525087c83992a44eb1ae3d04f72b8869e56f4ffeb5941
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b251f.bin rtf-objdata-decoded RTF \objdata at offset 0xB251F 33339 bytes
SHA-256: e259e4a1722518dac378b7255b309629a2605ded54e25c0598bf5f0c20999ce2
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c8437.bin rtf-objdata-decoded RTF \objdata at offset 0xC8437 33339 bytes
SHA-256: 1852387e142abfaae3cad6e6d1fe3cad6197884e709faff157cf11bba2d892bd
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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