arkei | f960b96c81f71d848a119d18aa4074ecaa71e39086a611f2dc637d579b9f6afa

Analysis

max time kernel
119s
max time network
119s
platform
windows7_x64
resource
win7-en-20211208
submitted
10/01/2022, 04:27

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General

Target
2d6eca88082c6abce764f8a54b9b9917.exe
Size 1.6MB
Sample220110-e24enadha6
SHA256 f960b96c81f71d848a119d18aa4074ecaa71e39086a611f2dc637d579b9f6afa
MD5 2d6eca88082c6abce764f8a54b9b9917
SHA1 c461c6e6da306986d9f853729c5ed03af1ee325e
SHA512 dbaa8b1dfd1ee3e0f636c3d1cfb25a101b2148569ddfc2404a49ba0a9985d74963378ff56e2f0d2a3cb3c2de5214f0f5e1f1e9a9b6b90b87660e2efd837b23b7
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 4 IoCs

stealer

resource	yara_rule
behavioral1/memory/1696-70-0x00000000003F0000-0x00000000007AF000-memory.dmp	family_arkei
behavioral1/memory/1696-71-0x00000000003F0000-0x00000000007AF000-memory.dmp	family_arkei
behavioral1/memory/1696-72-0x00000000003F0000-0x00000000007AF000-memory.dmp	family_arkei
behavioral1/memory/1696-73-0x00000000003F0000-0x00000000007AF000-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	2d6eca88082c6abce764f8a54b9b9917.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	2d6eca88082c6abce764f8a54b9b9917.exe

Deletes itself 1 IoCs

pid	Process
1864	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1696	2d6eca88082c6abce764f8a54b9b9917.exe
1696	2d6eca88082c6abce764f8a54b9b9917.exe
1696	2d6eca88082c6abce764f8a54b9b9917.exe
1696	2d6eca88082c6abce764f8a54b9b9917.exe
1696	2d6eca88082c6abce764f8a54b9b9917.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	2d6eca88082c6abce764f8a54b9b9917.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1696	2d6eca88082c6abce764f8a54b9b9917.exe
1696	2d6eca88082c6abce764f8a54b9b9917.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	2d6eca88082c6abce764f8a54b9b9917.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	2d6eca88082c6abce764f8a54b9b9917.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1968	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1696	2d6eca88082c6abce764f8a54b9b9917.exe
1696	2d6eca88082c6abce764f8a54b9b9917.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1696 wrote to memory of 1864	1696	2d6eca88082c6abce764f8a54b9b9917.exe	29
PID 1696 wrote to memory of 1864	1696	2d6eca88082c6abce764f8a54b9b9917.exe	29
PID 1696 wrote to memory of 1864	1696	2d6eca88082c6abce764f8a54b9b9917.exe	29
PID 1696 wrote to memory of 1864	1696	2d6eca88082c6abce764f8a54b9b9917.exe	29
PID 1864 wrote to memory of 1968	1864	cmd.exe	31
PID 1864 wrote to memory of 1968	1864	cmd.exe	31
PID 1864 wrote to memory of 1968	1864	cmd.exe	31
PID 1864 wrote to memory of 1968	1864	cmd.exe	31

C:\Users\Admin\AppData\Local\Temp\2d6eca88082c6abce764f8a54b9b9917.exe
"C:\Users\Admin\AppData\Local\Temp\2d6eca88082c6abce764f8a54b9b9917.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:1696
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\2d6eca88082c6abce764f8a54b9b9917.exe" & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1864
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - Delays execution with timeout.exe
    PID:1968

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/1696-60-0x0000000000230000-0x0000000000231000-memory.dmp

Download

memory/1696-70-0x00000000003F0000-0x00000000007AF000-memory.dmp

Download

memory/1696-63-0x00000000003F0000-0x00000000007AF000-memory.dmp

Download

memory/1696-62-0x00000000003F0000-0x00000000007AF000-memory.dmp

Download

memory/1696-61-0x0000000077880000-0x00000000778C7000-memory.dmp

Download

memory/1696-64-0x0000000075B00000-0x0000000075BAC000-memory.dmp

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memory/1696-65-0x0000000076001000-0x0000000076003000-memory.dmp

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memory/1696-69-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-68-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-54-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-71-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-72-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-73-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-59-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-58-0x00000000003F0000-0x00000000007AF000-memory.dmp

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memory/1696-57-0x00000000003F0000-0x00000000007AF000-memory.dmp

Download

memory/1696-56-0x0000000000270000-0x00000000002B4000-memory.dmp

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memory/1696-55-0x00000000003F0000-0x00000000007AF000-memory.dmp

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