quasar | a9704b9ec835390fe47e215aa4928bed85698818c5de90ad11e1bc61de12fff1

General

Target

Client-built.exe
Size

3.1MB
MD5

86bd4496eab8ed85c7806bbe8b4faeff
SHA1

93908110af4954cda171542785bf17c0203077f5
SHA256

a9704b9ec835390fe47e215aa4928bed85698818c5de90ad11e1bc61de12fff1
SHA512

53d49ada84dc2c712805beb18e00b10eb1d730ca9d02dc559b8c0594452eb2ac64af719cb26ec9b8cc4486969078e4640138a5be295f7e968fef2db4c08b1214
SSDEEP

49152:SvJI22SsaNYfdPBldt698dBcjH62RJ6GbR3LoGdOzGTHHB72eh2NT:Svq22SsaNYfdPBldt6+dBcjH62RJ6A

Score

10^/10

quasar victim discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

victim

C2

192.168.0.8:4782

Mutex

b4f8207c-44c4-442b-9a76-0a5ef954b8b8

Attributes

encryption_key
2EF56B2D5415EB3BBA2A2D7B6B83FB157B370CDE
install_name
cilent-bulit.exe
log_directory
Logs
reconnect_delay
100
startup_key
solara
subdirectory
cilent-bulit

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2636-1-0x00000000013C0000-0x00000000016E4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000017530-6.dat	family_quasar
behavioral1/memory/2776-9-0x0000000001040000-0x0000000001364000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

cilent-bulit.exe

pid	Process
2776	cilent-bulit.exe

Drops desktop.ini file(s) 7 IoCs

Processes:

wmplayer.exe

description	ioc	Process
File opened for modification	C:\Users\Admin\Music\desktop.ini	wmplayer.exe
File opened for modification	C:\Users\Public\desktop.ini	wmplayer.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	wmplayer.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	wmplayer.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	wmplayer.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	wmplayer.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	wmplayer.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:

wmplayer.exe

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

System Location Discovery: System Language Discovery 1 TTPs 2 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

Processes:

wmplayer.exewmpshare.exe

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

Modifies registry class 2 IoCs

Processes:

wmplayer.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Content Type\application/x-wmplayer	wmplayer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Content Type\application/x-wmplayer\CLSID = "{cd3afa96-b84f-48f0-9393-7edc34128127}"	wmplayer.exe

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

Processes:

schtasks.exeschtasks.exe

pid	Process
2940	schtasks.exe
2716	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.execilent-bulit.exe

description	pid	Process
Token: SeDebugPrivilege	2636	Client-built.exe
Token: SeDebugPrivilege	2776	cilent-bulit.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

wmplayer.exe

pid	Process
2528	wmplayer.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

Client-built.execilent-bulit.exewmplayer.exe

description	pid	Process	procid_target
PID 2636 wrote to memory of 2940	2636	Client-built.exe	30
PID 2636 wrote to memory of 2940	2636	Client-built.exe	30
PID 2636 wrote to memory of 2940	2636	Client-built.exe	30
PID 2636 wrote to memory of 2776	2636	Client-built.exe	32
PID 2636 wrote to memory of 2776	2636	Client-built.exe	32
PID 2636 wrote to memory of 2776	2636	Client-built.exe	32
PID 2776 wrote to memory of 2716	2776	cilent-bulit.exe	33
PID 2776 wrote to memory of 2716	2776	cilent-bulit.exe	33
PID 2776 wrote to memory of 2716	2776	cilent-bulit.exe	33
PID 2528 wrote to memory of 448	2528	wmplayer.exe	36
PID 2528 wrote to memory of 448	2528	wmplayer.exe	36
PID 2528 wrote to memory of 448	2528	wmplayer.exe	36
PID 2528 wrote to memory of 448	2528	wmplayer.exe	36

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2636
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\cilent-bulit\cilent-bulit.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2940
- C:\Users\Admin\AppData\Roaming\cilent-bulit\cilent-bulit.exe
  "C:\Users\Admin\AppData\Roaming\cilent-bulit\cilent-bulit.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2776
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\cilent-bulit\cilent-bulit.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2716

C:\Program Files (x86)\Windows Media Player\wmplayer.exe
"C:\Program Files (x86)\Windows Media Player\wmplayer.exe" /prefetch:1
1⤵
- Drops desktop.ini file(s)
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:2528
- C:\Program Files (x86)\Windows Media Player\wmpshare.exe
  "C:\Program Files (x86)\Windows Media Player\wmpshare.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:448

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

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\74d7f43c1561fc1e.customDestinations-ms~RFf77d6df.TMP

Filesize
1KB

MD5
17806687a7b317daa36014261b1f53f3

SHA1
7c6bf450eaabce8aa764995ebdb3430900067ead

SHA256
925d939f1c02d87cf3f0755c14f61171b4a7a6c1d05c6ec934695ede9f972190

SHA512
898e9e8fc58a3234ba4ec6a29be661475333c20f8512067f343e4f324f2300994eb482c0b1aed0665fc8642a40a3a5ea17e2c73b2fa7d6f77abe70a52f231780

Download Submit
C:\Users\Admin\AppData\Roaming\cilent-bulit\cilent-bulit.exe

Filesize
3.1MB

MD5
86bd4496eab8ed85c7806bbe8b4faeff

SHA1
93908110af4954cda171542785bf17c0203077f5

SHA256
a9704b9ec835390fe47e215aa4928bed85698818c5de90ad11e1bc61de12fff1

SHA512
53d49ada84dc2c712805beb18e00b10eb1d730ca9d02dc559b8c0594452eb2ac64af719cb26ec9b8cc4486969078e4640138a5be295f7e968fef2db4c08b1214

Download Submit
memory/2636-0-0x000007FEF4EB3000-0x000007FEF4EB4000-memory.dmp

Filesize
4KB

Download
memory/2636-1-0x00000000013C0000-0x00000000016E4000-memory.dmp

Filesize
3.1MB

Download
memory/2636-2-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download
memory/2636-8-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download
memory/2776-9-0x0000000001040000-0x0000000001364000-memory.dmp

Filesize
3.1MB

Download
memory/2776-10-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download
memory/2776-11-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download
memory/2776-12-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads