# CVE-2021-26855 - Cyber Threat Intelligence

These _indicators_ were reported, collected, and generated during the [VulDB CTI analysis](https://vuldb.com/?kb.cti) of the campaign known as _CVE-2021-26855_. The _activity monitoring_ correlates data from social media, forums, chat rooms, and darknet markets. It helps to determine associated actors, specific activities, expected intentions, emerging research, and ongoing attacks. Our unique _predictive model_ uses _big data_ to forecast activities and their characteristics.

_Live data_ and more _analysis capabilities_ are available at [https://vuldb.com/?actor](https://vuldb.com/?actor)

## Countries

These _countries_ are directly (e.g. origin of attacks) or indirectly (e.g. access by proxy) associated with CVE-2021-26855:

* [CN](https://vuldb.com/?country.cn)
* [US](https://vuldb.com/?country.us)
* [AE](https://vuldb.com/?country.ae)
* ...

There are 4 more country items available. Please use our online service to access the data.

## Actors

These _actors_ are associated with CVE-2021-26855 or other actors linked to the campaign.

ID | Actor | Confidence
-- | ----- | ----------
1 | [Unknown](https://vuldb.com/?actor.unknown) | High

## IOC - Indicator of Compromise

These _indicators of compromise_ (IOC) indicate associated network resources which are known to be part of research and attack activities of CVE-2021-26855.

ID | IP address | Hostname | Actor | Confidence
-- | ---------- | -------- | ----- | ----------
1 | [41.237.156.15](https://vuldb.com/?ip.41.237.156.15) | host-41.237.156.15.tedata.net | [Unknown](https://vuldb.com/?actor.unknown) | High
2 | [45.77.140.214](https://vuldb.com/?ip.45.77.140.214) | 45.77.140.214.vultr.com | [Unknown](https://vuldb.com/?actor.unknown) | Medium
3 | [63.76.255.110](https://vuldb.com/?ip.63.76.255.110) | - | [Unknown](https://vuldb.com/?actor.unknown) | High
4 | ... | ... | ... | ...

There are 10 more IOC items available. Please use our online service to access the data.

## TTP - Tactics, Techniques, Procedures

_Tactics, techniques, and procedures_ (TTP) summarize the suspected MITRE ATT&CK techniques used within CVE-2021-26855. This data is unique as it uses our predictive model for actor profiling.

ID | Technique | Weakness | Description | Confidence
-- | --------- | -------- | ----------- | ----------
1 | T1059.007 | CWE-79, CWE-80 | Cross Site Scripting | High
2 | T1068 | CWE-269, CWE-284 | Execution with Unnecessary Privileges | High
3 | T1505 | CWE-89 | SQL Injection | High
4 | ... | ... | ... | ...

There are 3 more TTP items available. Please use our online service to access the data.

## IOA - Indicator of Attack

These _indicators of attack_ (IOA) list the potential fragments used for technical activities like reconnaissance, exploitation, privilege escalation, and exfiltration during CVE-2021-26855. This data is unique as it uses our predictive model for actor profiling.

ID | Type | Indicator | Confidence
-- | ---- | --------- | ----------
1 | File | `/var/log/nginx` | High
2 | File | `catalog/productinfo/imageupload` | High
3 | File | `core/admin/modules/developer/modules/views/add.php` | High
4 | ... | ... | ...

There are 8 more IOA items available (file, library, argument, input value, pattern, network port). Please use our online service to access the data.

## References

The following list contains _external sources_ which discuss the campaign and the associated activities:

* https://unit42.paloaltonetworks.com/exchange-server-credential-harvesting/

## Literature

The following _articles_ explain our unique predictive cyber threat intelligence:

* [VulDB Cyber Threat Intelligence Documentation](https://vuldb.com/?kb.cti)
* [Cyber Threat Intelligence - Early Anticipation of Attacks](https://www.scip.ch/en/?labs.20201022)

## License

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