MALICIOUS — 21afd31f26c9d8be0948edebcd4c8c226e077d0eec719fc3962c79832ae79f21

MALICIOUS — 21afd31f26c9d8be0948edebcd4c8c226e077d0eec719fc3962c79832ae79f21 is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (96/100), attributed to the Bulz family. 5 of 55 detection engines flagged it, exhibiting 1 ATT&CK technique.

Identification

• SHA-256: 21afd31f26c9d8be0948edebcd4c8c226e077d0eec719fc3962c79832ae79f21
• SHA-1: c93aeae6eb194cd2596bcc9762741e85e0dd41f8
• MD5: 1fee9394c948e1cc29011c7560176211
• imphash: d3bc783da925e7c48a8f1e0e2c6c25b1
• ssdeep: 6144:XyX/HEpgPCbV1fNm3Tx0TpKidq2o7D29fx+J9zyHqYLL+o63kOQSzB:k/HEp64lQaVH8vaZ/M
• TLSH: T1B14C8D980902EA52E9B187515F303D6C993EF8E6327E2B4C23D7961FFAE316351710A4
• Submitted as: 21afd31f26c9d8be0948edebcd4c8c226e077d0eec719fc3962c79832ae79f21
• File type: pe · Size: 544768 bytes
• Verdict: malicious (96/100) · Family: Bulz

Detections (5 of 55 engines)

• capa (capabilities): capability:collection/keylog
• ClamAV (daily): Win.Malware.Bulz-9885565-0
• YARA: Yara-Rules community: YR_AntiDebug_Checks
• LIEF (executable format parser): lief:invalid-authenticode
• Microsoft Defender: flagged

MITRE ATT&CK

• T1056.001

Why this verdict

The malicious score of 96/100 is the fusion of 5 weighted signals:

• ClamAV (daily) flagged Win.Malware.Bulz-9885565-0 (rule Win.Malware.Bulz-9885565-0) - engine signal, weight 0.90, confidence 0.95
• capture keystrokes (rule capture keystrokes) - capa signal, weight 0.40, confidence 0.80
• YARA: Yara-Rules community flagged YR_AntiDebug_Checks (rule YR_AntiDebug_Checks) - engine signal, weight 0.35, confidence 0.70
• LIEF (executable format parser) flagged lief:invalid-authenticode (rule lief:invalid-authenticode) - engine signal, weight 0.35, confidence 0.70
• Embedded network infrastructure: http://bestswim.officeisp.net/Shared%20Documents/BESTmeetentryform.doc, http://www.zelphish.com/alki%20pipeline.pdf, 6.0.1.0 - static signal, weight 0.35, confidence 0.60

Dynamic analysis

No runtime behaviour was captured for this sample, so the analysis above is static only. That is a limit of this run rather than evidence the sample does nothing.

Embedded URLs

• http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
• http://www.microsoft.com/pki/certs/MicCodSigPCA_08-31-2010.crt0
• http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
• http://office.microsoft.com
• http://www.microsoft.com/pki/certs/MicRooCerAut_2010-06-23.crt0
• http://www.microsoft.com/pki/certs/MicTimStaPCA_2010-07-01.crt0
• http://bestswim.officeisp.net/Shared%20Documents/BESTmeetentryform.doc
• http://www.zelphish.com/alki%20pipeline.pdf

Embedded domains

• crl.microsoft.com
• www.microsoft.com
• office.microsoft.com
• bestswim.officeisp.net
• www.zelphish.com

Embedded IP addresses

• 6.0.1.0

File paths

• F:\Office\Target\x86\ship\postc2r\x-none\msouc.pdb
• X:\:d:
• H:\:`:p:t:x:
• X:\:l:p:

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report