arkei | 8f9ff0227f4ce6ed3259d5f2f8bfd8c54496e9896ad5f522cdd768911be4b4bc

Analysis

max time kernel
118s
max time network
120s
platform
windows7_x64
resource
win7-en-20211208
submitted
03/01/2022, 08:00

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General

Target
78c4c523fe6a7de58d799cf84e41553d.exe
Size 2.6MB
Sample220103-jv1gmsbbc4
SHA256 8f9ff0227f4ce6ed3259d5f2f8bfd8c54496e9896ad5f522cdd768911be4b4bc
MD5 78c4c523fe6a7de58d799cf84e41553d
SHA1 d380a74c0264d2f6f7c6e5b374de1bff7ac32da3
SHA512 1c292dbce11f702bbe412285e89a760b14cbfcfe93830bc2a9f648327454be4e6549cbe77e28f4e5e36913c81094876d2b8909bc20481942a789c43ed0bbf5c1
MD5 SHA1 SHA512

Score

10^/10

arkei discovery evasion spyware stealer trojan

Malware Config

Signatures

Arkei
Arkei is an infostealer written in C++.
stealer arkei

Arkei Stealer Payload 3 IoCs

stealer

resource	yara_rule
behavioral1/memory/1908-70-0x00000000010B0000-0x000000000134C000-memory.dmp	family_arkei
behavioral1/memory/1908-71-0x00000000010B0000-0x000000000134C000-memory.dmp	family_arkei
behavioral1/memory/1908-72-0x00000000010B0000-0x000000000134C000-memory.dmp	family_arkei

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

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Downloads MZ/PE file

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	78c4c523fe6a7de58d799cf84e41553d.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	78c4c523fe6a7de58d799cf84e41553d.exe

Deletes itself 1 IoCs

pid	Process
1064	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1908	78c4c523fe6a7de58d799cf84e41553d.exe
1908	78c4c523fe6a7de58d799cf84e41553d.exe
1908	78c4c523fe6a7de58d799cf84e41553d.exe
1908	78c4c523fe6a7de58d799cf84e41553d.exe
1908	78c4c523fe6a7de58d799cf84e41553d.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

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	78c4c523fe6a7de58d799cf84e41553d.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1908	78c4c523fe6a7de58d799cf84e41553d.exe
1908	78c4c523fe6a7de58d799cf84e41553d.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	78c4c523fe6a7de58d799cf84e41553d.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	78c4c523fe6a7de58d799cf84e41553d.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2036	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1908	78c4c523fe6a7de58d799cf84e41553d.exe
1908	78c4c523fe6a7de58d799cf84e41553d.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1908 wrote to memory of 1064	1908	78c4c523fe6a7de58d799cf84e41553d.exe	29
PID 1908 wrote to memory of 1064	1908	78c4c523fe6a7de58d799cf84e41553d.exe	29
PID 1908 wrote to memory of 1064	1908	78c4c523fe6a7de58d799cf84e41553d.exe	29
PID 1908 wrote to memory of 1064	1908	78c4c523fe6a7de58d799cf84e41553d.exe	29
PID 1064 wrote to memory of 2036	1064	cmd.exe	31
PID 1064 wrote to memory of 2036	1064	cmd.exe	31
PID 1064 wrote to memory of 2036	1064	cmd.exe	31
PID 1064 wrote to memory of 2036	1064	cmd.exe	31

C:\Users\Admin\AppData\Local\Temp\78c4c523fe6a7de58d799cf84e41553d.exe
"C:\Users\Admin\AppData\Local\Temp\78c4c523fe6a7de58d799cf84e41553d.exe"
1⤵
- Checks BIOS information in registry
- Loads dropped DLL
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1908
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\78c4c523fe6a7de58d799cf84e41553d.exe" & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1064
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:2036

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1908-66-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-72-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-62-0x00000000002F0000-0x0000000000335000-memory.dmp

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memory/1908-68-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-55-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-64-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-69-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-70-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-71-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-63-0x0000000076731000-0x0000000076733000-memory.dmp

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memory/1908-61-0x0000000075A80000-0x0000000075B2C000-memory.dmp

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memory/1908-60-0x0000000075EF0000-0x0000000075F37000-memory.dmp

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memory/1908-58-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-59-0x0000000000090000-0x0000000000091000-memory.dmp

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memory/1908-57-0x00000000010B0000-0x000000000134C000-memory.dmp

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memory/1908-56-0x00000000010B0000-0x000000000134C000-memory.dmp

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