G1012 Unknownour call,
not MITRE’s ATT&CK Group

CURIUM

How MITRE ATT&CK characterizes this group¹: CURIUM is an Iranian threat group, first reported in September 2019 and active since at least July 2018, targeting IT service providers in the Middle East. CURIUM has since invested in building relationships with potential targets via social media over a period of months to establish trust and confidence before sending malware. Security researchers note CURIUM has demonstrated great patience and persistence by chatting with potential targets daily and…

Origin / sponsor: not established from a curated public advisory — see Coverage & confidence. Not asserted here.

Also tracked as: Crimson Sandstorm TA456 Tortoise Shell Yellow Liderc — ATT&CK group page¹

Read this as · tier is our editorial call, not MITRE’s

Motivation not classified from the public record.

We could not place this actor into a coarse motivation tier from ATT&CK’s intrusion-set type and description prose. That uncertainty is itself a finding — the tradecraft below is still cited; the “why” is a coverage gap. All tradecraft below is sourced to MITRE ATT&CK.

Techniques

ATT&CK count¹

Named tools / malware

ATT&CK count²

Attributed campaigns

ATT&CK count¹

Tactics spanned

ATT&CK count¹

coverage gap

Activity bounds

no attributed campaign

Known for

— signature moves, each sourced to ATT&CK

ArsenalNamed tooling. ATT&CK attributes 1 tools/malware to this group, including IMAPLoader.²²

ReachFurthest outcome. This actor's cited tradecraft reaches as far as outcome 4 — Data at risk — exfiltration. (editorial mapping over ATT&CK tactics).

Tradecraft heatmap

— ATT&CK techniques mapped onto the five attacker-outcome narratives

Each row is a documented technique (MITRE ATT&CK). Each column is one of the five attacker-outcome narratives a defender funds against. A filled cell means this technique’s own ATT&CK tactic defensibly advances that outcome. The mapping of technique→outcome is our editorial alignment over ATT&CK's tactic data, not a separately-sourced MITRE edge. A filled cell means one of the technique's own ATT&CK tactics defensibly advances that outcome; enabler tactics (C2, Defense Evasion, Discovery) heat no column.

1Front door

2Keys to the kingdom

3Lateral reach

4Data at risk

5Lights out

T1005 Data from Local SystemCollection

●

T1041 Exfiltration Over C2 ChannelExfiltration

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T1048.002 Exfiltration Over Asymmetric Encrypted Non-C2 ProtocolExfiltration

●

T1059.001 PowerShellExecution

●

T1082 System Information DiscoveryDiscovery

T1124 System Time DiscoveryDiscovery

T1189 Drive-by CompromiseInitial Access

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T1204.002 Malicious FileExecution

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T1505.003 Web ShellPersistence

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T1566.001 Spearphishing AttachmentInitial Access

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T1566.003 Spearphishing via ServiceInitial Access

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T1583.001 DomainsResource Development

T1583.003 Virtual Private ServerResource Development

T1583.004 ServerResource Development

T1584.006 Web ServicesResource Development

T1585.001 Social Media AccountsResource Development

T1585.002 Email AccountsResource Development

T1598.003 Spearphishing LinkReconnaissance

T1608.004 Drive-by TargetResource Development

Reach: this actor’s cited techniques light columns 1·2·4 — furthest is 4 · Data at risk. (furthest-position idiom, reused from the landing map).

A dot = this technique advances that outcomeColumn 3 (Lateral reach) is empty — Compare: a hands-on-keyboard intruder lights column 3.Column 5 (Lights out) is empty — Compare: a ransomware or wiper actor lights column 5.

Editorial: the technique→outcome alignment is our call over ATT&CK’s tactic data, not a separately-sourced MITRE edge — same basis the landing page declares. Enabler tactics (C2, defense evasion, discovery) heat no column.¹

Arsenal

— named tools & malware ATT&CK attributes to this group

IMAPLoaderS1152 · Malware

ATT&CK S1152 ↗

Campaign highlights

— attributed operations in the ATT&CK record

No attributed campaigns — coverage gap

Stated, not hidden

ATT&CK lists no first-class campaign object for G1012 at this snapshot. Public reporting may tie this actor to operations; those enter only with a named advisory under the same cite-or-die rule.

Latest activity

— with explicit confidence, and what we cannot yet claim

ATT&CK
snapshot

The most recent cited activity in this card is the ATT&CK record itself. We do not paste a “last seen this week” line we cannot source. Recency from secondary reporting appears here only when attached to a named advisory.

ATT&CK snapshot, compiled 2026-06-22Coverage gap — live “currently active” status not asserted

CVE ↔ actor bridge: no confirmed CVE link is established for this group. ATT&CK provides no first-class group→CVE relationship, so this card does not claim specific CVEs as “exploited by this actor” unless a named advisory says so. Absence of a CVE here is a coverage gap, never a clean bill — confirmed links surface as a cited, linked list as the advisory bridge grows.

Coverage & confidence

— what we know, and what we don’t

Established (cited)

Group identity, aliases, description — MITRE ATT&CK group page

19 techniques — ATT&CK technique pages (linked per row)

1 software (arsenal) — ATT&CK software pages

5 third-party research citations — ATT&CK external references

Coverage gaps — stated, not hidden

Origin/sponsor not established from a curated public advisory. ATT&CK prose may imply attribution but is not asserted here — absence of a curated source is a coverage finding, not a clean bill of attribution.

Threat tier is OUR editorial classification (rule-based), not a MITRE field — labeled as such.

Technique → outcome heatmap is editorial alignment over ATT&CK tactic data, not a separately-sourced MITRE edge.

Activity bounds are a floor from attributed-campaign dates only — flagged approx., not a true active-since range.

ATT&CK has no first-class group→CVE relationship; this card asserts no specific CVE without a named advisory.

No attributed ATT&CK campaign object — activity bounds cannot be established.

Empty heatmap column(s): Lateral reach, Lights out — consistent with this actor's nature, stated as a finding.