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cristianchiriac/README.md

Cristian Chiriac

Cybersecurity Engineer

Blue Team · Threat Hunting · Detection Engineering

Building better detections, investigating suspicious behavior, and improving defensive security through practical engineering.


About

Cybersecurity engineer focused on defensive security, threat hunting, detection engineering, and open-source security research.

I work on understanding attacker behavior, making security telemetry actionable, and strengthening tools that defenders rely on.

ORCID: 0009-0006-0583-046X

Selected Security Contributions

  • SigmaHQ / pySigma — parsing, correlation handling, and robust Sigma rule processing.
  • Velociraptor — Windows forensic artifact corrections and ATT&CK mapping maintenance.
  • Splunk Sigma backend — correcting query precedence in SPL and SPL2.
  • Sysmon Modular — mapping WMI permanent event subscription events to MITRE ATT&CK.
  • Volatility 3 — Windows memory forensics error handling.
  • DefectDojo — robust vulnerability intelligence ingestion.

Open Source Contributions

54 merged pull requests across 44 independent upstream repositories.

Every linked PR was merged in the upstream project; open or closed-unmerged PRs are not included.

Upstream repository Most recent merged change Merged PRs
SigmaHQ/pySigma fix: compile |re values with the rule's policy #585 · #545 · #544 · #542 · #541
firewalla/firewalla Unenforce the per-rule sets of a global domain rule with ipttl #9954 · #9953 · #9910 · #9909
dgunning/edgartools fix(search): drop an amendment form code whose root form is also listed #1545 · #1533
posit-dev/pointblank fix: support steps with several columns in get_dataframe_report() #444 · #445
Velocidex/velociraptor Replace revoked ATT&CK technique IDs in artifacts #5047 · #5016
Flexget/Flexget Read the transmission-rpc version once at import #5263
HKUDS/nanobot fix(cli): set SPT_NOENV only on Linux #6232
lingui/swc-plugin fix: transform a useLingui t nested in a placeholder of another t #285
OHF-Voice/wyoming-faster-whisper Constrain PyAV below 19 until faster-whisper supports it #130
unitaryai/detoxify Drop pytest-flake8 from test requirements to fix CI on pytest 9 #137
olafhartong/sysmon-modular Map WMI event subscription events (EID 19/20/21) to T1546.003 #227
open-jarvis/OpenJarvis fix(speech): constrain PyAV below 19 for faster-whisper #1094
JFryy/qq Stringify non-string YAML mapping keys (fixes #73) #74
pyxem/orix Support Matplotlib 3.12 ArtistList location #688
Chocobozzz/PeerTube Constrain PyAV when installing whisper-ctranslate2 #7815
orval-labs/orval fix(core): do not alias self-referencing schemas in single schemas mode #4298
nuxt/ui perf(useComponentProps): skip prop resolution for Vue internal flags #7186
boa-dev/boa fix(engine): accept lone surrogate escapes in JSON.parse #5578
huggingface/speech-to-speech Add an opt-in --torch_num_threads setting for PyTorch CPU threads #707
coin-or/pulp Make pulptest work from an installed package #953
career-ops-hq/career-ops fix(batch): give node a Windows path for PROJECT_DIR under Git Bash #5051
Oldcircle/geo-sleuth fonts: find CJK fonts on Windows, allow a GEO_FONT override #13
volatilityfoundation/volatility3 Windows: Raise TypeError instead of a bare raise in virtmap and crashinfo #2035
NetroScript/Graveyard-Keeper-Savefile-Editor Read the Eel version with importlib.metadata (fixes #106) #107
sgl-project/sglang-omni [ASR] Probe audio duration with PyAV 19 #2557
bacescuandrei/macos-inspector Remove unused imports and variables #1
oreilles/polars-st Fix import on Polars 2 (GeoSeries metaclass conflict) #85
datajuicer/data-juicer fix(mapper): use the Lexbor parser in clean_html_mapper #1085
Kometa-Team/Quickstart Skip no-commit-to-branch in the Lint workflow #1878
turbot/steampipe-mod-aws-compliance Fix port ranges in vpc_security_group_restricted_common_ports query #978
arxhr007/Aliens_eye Use the Lexbor parser of selectolax (fix ImportError with selectolax 1.0) #23
yeti-platform/yeti Install the plugins dependency group in the feed tests workflow #1408
harry0703/MoneyPrinterTurbo Constrain PyAV below 19 in requirements.txt #1582
Kometa-Team/Kometa Report failed Apprise notifications with Apprise 2 #3690
wayne-csrs/pySigma-backend-signals fix: keep correlation event_type unquoted with pySigma >= 1.5.1 #9
kaixxx/noScribe Pin PyAV below 19 until faster-whisper supports it #367
ipython/ipykernel Update README install command for the test dependency group #1573
Softcatala/whisper-ctranslate2 Constrain PyAV below 19 in the package requirements #154
nornir-automation/nornir Deprecate legacy Jinja2 rendering helpers #1103
logpoint/pySigma-backend-logpoint Fix AttributeError for numeric pipeline pre-filter values #38
DefectDojo/django-DefectDojo fix(govulncheck): don't crash on OSV entries without aliases #16014
SigmaHQ/pySigma-backend-crowdstrike fix: OR nested inside AND was not parenthesized, widening the emitted query #25
SigmaHQ/pySigma-backend-splunk fix: OR/AND precedence inversion widens emitted queries in SPL and SPL2 backends #77
benmoran56/esper Fix _get_components() dropping a filter type when the min-size set changes twice #124

Latest confirmed merge: 2026-10-16 (UTC).

View all merged pull requests on GitHub →


GitHub Activity

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Contribution graph & activity → · Merged PRs → · Open PRs →


Defensive Security · Detection Engineering · Threat Hunting

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