`188.43.136.41`

188.43.136.41 is an IP address that 2 published sources report in connection with IT Worker Fraud activity, which public reporting attributes to North Korea (DPRK). It is cited here from Cookie Connoisseur (@browsercookies) and ReliaQuest. The earliest of those reports is dated 2025-04-21 and the most recent 2025-05-08.

The reporting files it under the persona Josh Mack, alongside 3 other identifiers attributed to the same identity. The persona page shows them together with any accounts, photographs and CV recorded under that name. A persona name is the one an account presented under, and may belong to an uninvolved person whose identity was taken.

ip address IT Worker Fraud MATCHED IN SOURCE

First seen 2025-04-21 · last seen 2025-05-08

Network

Kind	fixed line
Network	TRANS-TELECOM
Announced by	AS20485 Joint Stock Company TransTeleCom
Country	Russia

Looked up 2026-09-21 at ip-api.com. A subscriber line, as a person working from home ordinarily has.

Sources

The post asserts one identity outright, that Josh Mack and the GitHub account rossryuli are the same. The rest it states as links rather than equivalences: Kanbei is linked to mjoshalchi@gmail.com, and that address to rossryuli. The IP address is given as Russian and appears in the post immediately after the rossryuli line. The researcher writes the address without a top-level domain, as mjoshalchi[@]gmail.
x.com/browsercookies/status/1914447750445588965 — Cookie Connoisseur (@browsercookies) · under “Josh Mack / Rossryuli” · published 2025-04-21 · pulled 2026-08-30
…associated with this campaign; many are geo-located in Khabarovsk, Russia: 80.237.84.12 80.237.87.21 83.234.227.33-8 188.43.33.252 188.43.136.41,115 188.43.253.77 China Unicom ISP China remains North Korea’s most critical ally, providing political support, economic aid, and…
Threat Spotlight: Red Flags for Red Star Hackers: Hunting for North Korean Insiders - ReliaQuest — ReliaQuest · under “Russian TTK ISP” · published 2025-05-08 · pulled 2026-09-01

Find this indicator in the index, or see every IP address this site holds under IP addresses in the browse listing.

Related indicators

Same persona record: Josh Mack

Other identifiers the reporting files under the same persona; 2 of 3 are shown.

All 3 on the Josh Mack page

Cited by the same report: x.com/browsercookies/status/1914447750445588965

Cookie Connoisseur (@browsercookies) lists 3 other indicators in this source. 1 are shown, chosen across types.

All 4 indicators from this source

Cited by the same report: Threat Spotlight: Red Flags for Red Star Hackers: Hunting for North Korean Insiders - ReliaQuest

ReliaQuest lists 10 other indicators in this source. 9 are shown, chosen across types.

All 11 indicators from this source