87b79299b17bd64c49dd2681f278dfffdf95848a944d20c68c807e44f5d320cb

General

Target

Cobalt-Main/Cobalt.exe
Size

57KB
MD5

d7c9cd322313aae1c6d377c2fb55b4e6
SHA1

82018a4918394f57760b3409da34e881b4d85acb
SHA256

228a27a3ed89a391c4e58a5de1909ed0b2e85a30e55020717eded26b71f4fedf
SHA512

bb8b966b7a68844d7470931fe85982b9034d806fb484392e3f928e426678bbe3155188c9788290a5178758889d9cc19da77e4a0018aa483914345e1bb3027f55
SSDEEP

1536:3DBzpoTSaKlIds/o3TSaKlIds/oQTSaKlIds/o6:3Z+TSawIdsA3TSawIdsAQTSawIdsA6

Score

9^/10

discovery evasion themida trojan

Malware Config

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	Cobalt.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Cobalt.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Cobalt.exe

Themida packer 9 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral8/memory/2576-6-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-8-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-10-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-9-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-12-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-11-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-13-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-22-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida
behavioral8/memory/2576-23-0x00000000703C0000-0x0000000070C8C000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Cobalt.exe

Network Service Discovery 1 TTPs 1 IoCs

Attempt to gather information on host's network.

discovery

Network Service Discovery

T1046

pid	Process
3624	GameBarPresenceWriter.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2576	Cobalt.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Cobalt.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2576	Cobalt.exe
2576	Cobalt.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2576	Cobalt.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3228	OpenWith.exe

C:\Users\Admin\AppData\Local\Temp\Cobalt-Main\Cobalt.exe
"C:\Users\Admin\AppData\Local\Temp\Cobalt-Main\Cobalt.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2576

C:\Windows\System32\GameBarPresenceWriter.exe
"C:\Windows\System32\GameBarPresenceWriter.exe" -ServerName:Windows.Gaming.GameBar.Internal.PresenceWriterServer
1⤵
- Network Service Discovery
PID:3624

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Suspicious use of SetWindowsHookEx
PID:3228

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Network Service Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2576-0-0x0000000074CAE000-0x0000000074CAF000-memory.dmp

Filesize
4KB

Download
memory/2576-1-0x0000000000870000-0x0000000000884000-memory.dmp

Filesize
80KB

Download
memory/2576-2-0x0000000005860000-0x0000000005E04000-memory.dmp

Filesize
5.6MB

Download
memory/2576-3-0x00000000052B0000-0x0000000005342000-memory.dmp

Filesize
584KB

Download
memory/2576-5-0x0000000074CA0000-0x0000000075450000-memory.dmp

Filesize
7.7MB

Download
memory/2576-4-0x0000000005280000-0x000000000528A000-memory.dmp

Filesize
40KB

Download
memory/2576-6-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-7-0x0000000074CA0000-0x0000000075450000-memory.dmp

Filesize
7.7MB

Download
memory/2576-8-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-10-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-9-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-12-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-11-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-13-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-20-0x0000000074CAE000-0x0000000074CAF000-memory.dmp

Filesize
4KB

Download
memory/2576-21-0x0000000074CA0000-0x0000000075450000-memory.dmp

Filesize
7.7MB

Download
memory/2576-22-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download
memory/2576-23-0x00000000703C0000-0x0000000070C8C000-memory.dmp

Filesize
8.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads