quasar | 853cf003dd01ec972a222a28b1e8b260fb06fab20245e609cb7df103d110343f

General

Target

RC7old.exe
Size

3.1MB
MD5

5efb08d03470612d11124136accc84fa
SHA1

46abe602f6566ff6103f504ef8ae73f43eae19c1
SHA256

853cf003dd01ec972a222a28b1e8b260fb06fab20245e609cb7df103d110343f
SHA512

13a1fbeae357662e2e2a60e511a3bce2f63fef40a96ba49f25e745dd466ca3da24de5155f0f2233e8d15941f353a21df14247ab7b4ebf84ee419ca7d7b7ae74a
SSDEEP

49152:CvHI22SsaNYfdPBldt698dBcjHuYREEf/yk/65LoGdvYAFTHHB72eh2NT:Cvo22SsaNYfdPBldt6+dBcjHuYRkp

Score

10^/10

quasar rc7old spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

RC7old

C2

yellow-parts.gl.at.ply.gg:52085

Mutex

8356bffd-2b62-44f9-937c-4adee31d9ea3

Attributes

encryption_key
5471C1CD3CF5D10BA14E0A632D9E07BC5FEE0E2B
install_name
RC7old.exe
log_directory
Logs
reconnect_delay
3000
startup_key
System
subdirectory
System

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4204-1-0x0000000000790000-0x0000000000AB4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b7a-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2996	RC7old.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\System	RC7old.exe
File created	C:\Windows\system32\System\RC7old.exe	RC7old.exe
File opened for modification	C:\Windows\system32\System\RC7old.exe	RC7old.exe
File opened for modification	C:\Windows\system32\System	RC7old.exe
File opened for modification	C:\Windows\system32\System\RC7old.exe	RC7old.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2468	schtasks.exe
3620	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4204	RC7old.exe
Token: SeDebugPrivilege	2996	RC7old.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2996	RC7old.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2996	RC7old.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4204 wrote to memory of 2468	4204	RC7old.exe	83
PID 4204 wrote to memory of 2468	4204	RC7old.exe	83
PID 4204 wrote to memory of 2996	4204	RC7old.exe	85
PID 4204 wrote to memory of 2996	4204	RC7old.exe	85
PID 2996 wrote to memory of 3620	2996	RC7old.exe	86
PID 2996 wrote to memory of 3620	2996	RC7old.exe	86

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\RC7old.exe
"C:\Users\Admin\AppData\Local\Temp\RC7old.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4204
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Windows\system32\System\RC7old.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2468
- C:\Windows\system32\System\RC7old.exe
  "C:\Windows\system32\System\RC7old.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2996
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Windows\system32\System\RC7old.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3620

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RC7old.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Windows\System32\System\RC7old.exe

Filesize
3.1MB

MD5
5efb08d03470612d11124136accc84fa

SHA1
46abe602f6566ff6103f504ef8ae73f43eae19c1

SHA256
853cf003dd01ec972a222a28b1e8b260fb06fab20245e609cb7df103d110343f

SHA512
13a1fbeae357662e2e2a60e511a3bce2f63fef40a96ba49f25e745dd466ca3da24de5155f0f2233e8d15941f353a21df14247ab7b4ebf84ee419ca7d7b7ae74a

Download Submit
memory/2996-11-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

Filesize
10.8MB

Download
memory/2996-12-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

Filesize
10.8MB

Download
memory/2996-13-0x000000001C5B0000-0x000000001C600000-memory.dmp

Filesize
320KB

Download
memory/2996-14-0x000000001C6C0000-0x000000001C772000-memory.dmp

Filesize
712KB

Download
memory/2996-15-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

Filesize
10.8MB

Download
memory/4204-0-0x00007FFD6D403000-0x00007FFD6D405000-memory.dmp

Filesize
8KB

Download
memory/4204-1-0x0000000000790000-0x0000000000AB4000-memory.dmp

Filesize
3.1MB

Download
memory/4204-2-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

Filesize
10.8MB

Download
memory/4204-10-0x00007FFD6D400000-0x00007FFD6DEC1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads