quasar | fb80d28a129184b6a273bd893aeee80765b6ec3eb617d90c6d32d0738bcbbfef

Reason

Machine shutdown

General

Target

Beta.exe
Size

3.1MB
MD5

bb26a2979d9a61725f910422403ed4dd
SHA1

b46d4a3a7f7253e1d7268c060702d301ebb36dd6
SHA256

fb80d28a129184b6a273bd893aeee80765b6ec3eb617d90c6d32d0738bcbbfef
SHA512

dfa1d068282cae728f6adf890065c0dcecbf9215646f50313d995afd209f52c07f3fd8e1e414c8712af1e2b5306ef453a9b6419f1c574dbd445acbc276426200
SSDEEP

49152:ivEt62XlaSFNWPjljiFa2RoUYI9ihqKhHvJQMoGd9THHB72eh2NT:ivY62XlaSFNWPjljiFXRoUYImh5

Score

10^/10

quasar astro-1 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Astro-1

C2

arthurus36.duckdns.org:5555

Mutex

ad7cd985-5e2e-45a3-9246-b82449c7c4d8

Attributes

encryption_key
6314C8C60AA1035CEB920FD38F0342E398BAF5D0
install_name
cmdprmpt.exe
log_directory
Logs
reconnect_delay
3000
startup_key
systemdex

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2032-1-0x0000000000DA0000-0x00000000010C4000-memory.dmp	family_quasar
C:\Windows\System32\cmdprmpt.exe	family_quasar
behavioral1/memory/2116-8-0x0000000000F30000-0x0000000001254000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

cmdprmpt.exe

pid process

2116 cmdprmpt.exe

pid	process
2116	cmdprmpt.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

mstsc.exe

description	ioc	process
File opened (read-only)	\??\B:	mstsc.exe
File opened (read-only)	\??\E:	mstsc.exe
File opened (read-only)	\??\K:	mstsc.exe
File opened (read-only)	\??\L:	mstsc.exe
File opened (read-only)	\??\P:	mstsc.exe
File opened (read-only)	\??\U:	mstsc.exe
File opened (read-only)	\??\R:	mstsc.exe
File opened (read-only)	\??\X:	mstsc.exe
File opened (read-only)	\??\Y:	mstsc.exe
File opened (read-only)	\??\A:	mstsc.exe
File opened (read-only)	\??\I:	mstsc.exe
File opened (read-only)	\??\J:	mstsc.exe
File opened (read-only)	\??\M:	mstsc.exe
File opened (read-only)	\??\N:	mstsc.exe
File opened (read-only)	\??\Q:	mstsc.exe
File opened (read-only)	\??\Z:	mstsc.exe
File opened (read-only)	\??\G:	mstsc.exe
File opened (read-only)	\??\H:	mstsc.exe
File opened (read-only)	\??\O:	mstsc.exe
File opened (read-only)	\??\S:	mstsc.exe
File opened (read-only)	\??\T:	mstsc.exe
File opened (read-only)	\??\V:	mstsc.exe
File opened (read-only)	\??\W:	mstsc.exe

Drops file in System32 directory 3 IoCs

Processes:

Beta.execmdprmpt.exe

description	ioc	process
File created	C:\Windows\system32\cmdprmpt.exe	Beta.exe
File opened for modification	C:\Windows\system32\cmdprmpt.exe	Beta.exe
File opened for modification	C:\Windows\system32\cmdprmpt.exe	cmdprmpt.exe

Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

2720 schtasks.exe
2080 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Beta.execmdprmpt.exe

description pid process

Token: SeDebugPrivilege 2032 Beta.exe
Token: SeDebugPrivilege 2116 cmdprmpt.exe

pid	process
2720	schtasks.exe
2080	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2032	Beta.exe
Token: SeDebugPrivilege	2116	cmdprmpt.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Beta.execmdprmpt.exe

description	pid	process	target process
PID 2032 wrote to memory of 2080	2032	Beta.exe	schtasks.exe
PID 2032 wrote to memory of 2080	2032	Beta.exe	schtasks.exe
PID 2032 wrote to memory of 2080	2032	Beta.exe	schtasks.exe
PID 2032 wrote to memory of 2116	2032	Beta.exe	cmdprmpt.exe
PID 2032 wrote to memory of 2116	2032	Beta.exe	cmdprmpt.exe
PID 2032 wrote to memory of 2116	2032	Beta.exe	cmdprmpt.exe
PID 2116 wrote to memory of 2720	2116	cmdprmpt.exe	schtasks.exe
PID 2116 wrote to memory of 2720	2116	cmdprmpt.exe	schtasks.exe
PID 2116 wrote to memory of 2720	2116	cmdprmpt.exe	schtasks.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Beta.exe
"C:\Users\Admin\AppData\Local\Temp\Beta.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2032
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "systemdex" /sc ONLOGON /tr "C:\Windows\system32\cmdprmpt.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2080
- C:\Windows\system32\cmdprmpt.exe
  "C:\Windows\system32\cmdprmpt.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2116
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "systemdex" /sc ONLOGON /tr "C:\Windows\system32\cmdprmpt.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2720

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2880

C:\Windows\system32\mstsc.exe
"C:\Windows\system32\mstsc.exe"
1⤵
- Enumerates connected drives
PID:2796

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0
1⤵
PID:1520

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x1
1⤵
PID:2784

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\cmdprmpt.exe

Filesize
3.1MB

MD5
bb26a2979d9a61725f910422403ed4dd

SHA1
b46d4a3a7f7253e1d7268c060702d301ebb36dd6

SHA256
fb80d28a129184b6a273bd893aeee80765b6ec3eb617d90c6d32d0738bcbbfef

SHA512
dfa1d068282cae728f6adf890065c0dcecbf9215646f50313d995afd209f52c07f3fd8e1e414c8712af1e2b5306ef453a9b6419f1c574dbd445acbc276426200

Download Submit
memory/2032-0-0x000007FEF5863000-0x000007FEF5864000-memory.dmp

Filesize
4KB

Download
memory/2032-1-0x0000000000DA0000-0x00000000010C4000-memory.dmp

Filesize
3.1MB

Download
memory/2032-2-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

Filesize
9.9MB

Download
memory/2032-9-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

Filesize
9.9MB

Download
memory/2116-8-0x0000000000F30000-0x0000000001254000-memory.dmp

Filesize
3.1MB

Download
memory/2116-10-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

Filesize
9.9MB

Download
memory/2116-11-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

Filesize
9.9MB

Download
memory/2116-12-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

Filesize
9.9MB

Download
memory/2116-14-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads