asyncrat | 4d8c876b969caf2449f169f89ec257f5e1412e23b609ab4f7c7ee72cd4b0de60

General

Target

RuntimeBroker.exe
Size

45KB
MD5

7a984e3a8ef99e429ceef1f1ddc144f4
SHA1

581dd32af3c53b1dc7b8a95aa2805ee0e8f44190
SHA256

4d8c876b969caf2449f169f89ec257f5e1412e23b609ab4f7c7ee72cd4b0de60
SHA512

b078b827e49cddfd743dd55802c0a48dc5056ccb172cb83a65e484a26c62fa30e1fa6860621752d4adbad3e5d234d759c817a0c0b3532531a99f50f05622bf6a
SSDEEP

768:ruGr1TVhfPNWUtWuHmo2qzVh7N78wJuPIozjbNVgXKDi4Rj6nKBDZjx:ruGr1TVxx2GFN4iXo3bsXjCj6nUdjx

Score

10^/10

asyncrat default discovery rat spyware stealer

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

holefo2785-22820.portmap.host:22820

holefo2785-22820.portmap.host:6606

Mutex

I674w9YbNo4n

Attributes

delay
3
install
true
install_file
RuntimeBroker.exe
install_folder
%AppData%

aes.plain

1
ZPMgXRNDWjLWpAwd4K1szMfec1Eo6chl

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x001a00000002b188-9.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
5528	RuntimeBroker.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 10 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 2 IoCs

defense_evasion

pid	Process
1692	timeout.exe
5376	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1788	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe
1492	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1492	RuntimeBroker.exe
Token: SeDebugPrivilege	5528	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1492 wrote to memory of 5696	1492	RuntimeBroker.exe	79
PID 1492 wrote to memory of 5696	1492	RuntimeBroker.exe	79
PID 1492 wrote to memory of 5696	1492	RuntimeBroker.exe	79
PID 1492 wrote to memory of 3720	1492	RuntimeBroker.exe	81
PID 1492 wrote to memory of 3720	1492	RuntimeBroker.exe	81
PID 1492 wrote to memory of 3720	1492	RuntimeBroker.exe	81
PID 5696 wrote to memory of 1788	5696	cmd.exe	83
PID 5696 wrote to memory of 1788	5696	cmd.exe	83
PID 5696 wrote to memory of 1788	5696	cmd.exe	83
PID 3720 wrote to memory of 1692	3720	cmd.exe	84
PID 3720 wrote to memory of 1692	3720	cmd.exe	84
PID 3720 wrote to memory of 1692	3720	cmd.exe	84
PID 3720 wrote to memory of 5528	3720	cmd.exe	85
PID 3720 wrote to memory of 5528	3720	cmd.exe	85
PID 3720 wrote to memory of 5528	3720	cmd.exe	85
PID 5528 wrote to memory of 556	5528	RuntimeBroker.exe	87
PID 5528 wrote to memory of 556	5528	RuntimeBroker.exe	87
PID 5528 wrote to memory of 556	5528	RuntimeBroker.exe	87
PID 5528 wrote to memory of 5272	5528	RuntimeBroker.exe	89
PID 5528 wrote to memory of 5272	5528	RuntimeBroker.exe	89
PID 5528 wrote to memory of 5272	5528	RuntimeBroker.exe	89
PID 5272 wrote to memory of 5376	5272	cmd.exe	91
PID 5272 wrote to memory of 5376	5272	cmd.exe	91
PID 5272 wrote to memory of 5376	5272	cmd.exe	91
PID 556 wrote to memory of 2408	556	cmd.exe	92
PID 556 wrote to memory of 2408	556	cmd.exe	92
PID 556 wrote to memory of 2408	556	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1492
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5696
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1788
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7F32.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3720
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1692
- - C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
    "C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:5528
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "RuntimeBroker"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:556
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "RuntimeBroker"
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:2408
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE6D1.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:5272
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:5376

Network

DNS

holefo2785-22820.portmap.host

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

holefo2785-22820.portmap.host

IN A

Response

holefo2785-22820.portmap.host

IN A

193.161.193.99
DNS

ctldl.windowsupdate.com

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

ctldl.windowsupdate.com

IN A

Response

ctldl.windowsupdate.com

IN CNAME

ctldl.windowsupdate.com.delivery.microsoft.com

ctldl.windowsupdate.com.delivery.microsoft.com

IN CNAME

wu-b-net.trafficmanager.net

wu-b-net.trafficmanager.net

IN CNAME

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.81.130.133

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.80.49.85

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.80.49.86

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.80.49.21

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.81.130.134

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.81.129.181

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.80.49.20

edge.ds-c7110-microsoft.global.dns.qwilted-cds.cqloud.com

IN A

91.81.129.180
DNS

99.193.161.193.in-addr.arpa

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

99.193.161.193.in-addr.arpa

IN PTR

Response
DNS

nexusrules.officeapps.live.com

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

nexusrules.officeapps.live.com

IN A

Response

nexusrules.officeapps.live.com

IN CNAME

prod.nexusrules.live.com.akadns.net

prod.nexusrules.live.com.akadns.net

IN A

52.111.229.48
DNS

self.events.data.microsoft.com

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

self.events.data.microsoft.com

IN A

Response

self.events.data.microsoft.com

IN CNAME

self-events-data.trafficmanager.net

self-events-data.trafficmanager.net

IN CNAME

onedscolprdcus19.centralus.cloudapp.azure.com

onedscolprdcus19.centralus.cloudapp.azure.com

IN A

52.182.143.214
DNS

ctldl.windowsupdate.com

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

ctldl.windowsupdate.com

IN A

Response

ctldl.windowsupdate.com

IN CNAME

ctldl.windowsupdate.com.delivery.microsoft.com

ctldl.windowsupdate.com.delivery.microsoft.com

IN CNAME

wu-b-net.trafficmanager.net

wu-b-net.trafficmanager.net

IN CNAME

download.windowsupdate.com.edgesuite.net

download.windowsupdate.com.edgesuite.net

IN CNAME

a767.dspw65.akamai.net

a767.dspw65.akamai.net

IN A

2.18.190.77

a767.dspw65.akamai.net

IN A

2.18.190.79
DNS

77.190.18.2.in-addr.arpa

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

77.190.18.2.in-addr.arpa

IN PTR

Response

77.190.18.2.in-addr.arpa

IN PTR

a2-18-190-77deploystaticakamaitechnologiescom
DNS

167.173.78.104.in-addr.arpa

RuntimeBroker.exe

Remote address:

8.8.8.8:53

Request

167.173.78.104.in-addr.arpa

IN PTR

Response

167.173.78.104.in-addr.arpa

IN PTR

a104-78-173-167deploystaticakamaitechnologiescom

193.161.193.99:22820

holefo2785-22820.portmap.host

tls

RuntimeBroker.exe

19.3kB
598.1kB
306
480
193.161.193.99:22820

holefo2785-22820.portmap.host

tls

RuntimeBroker.exe

768 B
361 B
8
5
193.161.193.99:22820

holefo2785-22820.portmap.host

tls

RuntimeBroker.exe

454 B
361 B
6
5

8.8.8.8:53

holefo2785-22820.portmap.host

dns

RuntimeBroker.exe

581 B
1.5kB
8
8

DNS Request

holefo2785-22820.portmap.host

DNS Response

193.161.193.99

DNS Request

ctldl.windowsupdate.com

DNS Response

91.81.130.133

91.80.49.85

91.80.49.86

91.80.49.21

91.81.130.134

91.81.129.181

91.80.49.20

91.81.129.180

DNS Request

99.193.161.193.in-addr.arpa

DNS Request

nexusrules.officeapps.live.com

DNS Response

52.111.229.48

DNS Request

self.events.data.microsoft.com

DNS Response

52.182.143.214

DNS Request

ctldl.windowsupdate.com

DNS Response

2.18.190.77

2.18.190.79

DNS Request

77.190.18.2.in-addr.arpa

DNS Request

167.173.78.104.in-addr.arpa

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

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\RuntimeBroker.exe.log

Filesize
522B

MD5
db9f45365506c49961bfaf3be1475ad2

SHA1
6bd7222f7b7e3e9685207cb285091c92728168e4

SHA256
3a8c487575696f7ace931dc220c85a47d33e0ead96aa9e47c705fee5dfac667a

SHA512
807028e2aed5b25b2d19ec4f09867746456de4e506c90c73e6730b35303511349a79ca0b9290509664edc0433d47e3fc7f2661534293ebb82185b1494da86a41

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp7F32.tmp.bat

Filesize
157B

MD5
798111abd16ae4ff04844750f696fea3

SHA1
4d5831313b5b4f36ec5dfa14a1abd96ebb56bc97

SHA256
a4c7714cdbc4e8f0fcff1d0184cf3021a7e950a8cc78a5f5ed63956200229c96

SHA512
dc7f98a5314cd086bdab8b6c4add0c1dc1c3f7f48ef6aeb71ec9e2121b913d16b957f976b5459c626b9cab43f92cbed2265053a4841e12dc14ee48acdf6e4ed5

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpE6D1.tmp.bat

Filesize
162B

MD5
eeb17e530eb4c24b5c70015136d7c80c

SHA1
a8e09e5b8c41ca3d950c0250ffb5c5108a23b876

SHA256
e71a506310c0da8869d7f1fed5cf131d33a10383a4b630c01c3ed3a6306cce90

SHA512
9a0cd20e55e939c8e04f1f9615de736733f7e09ef6e21d22348833535db12717ed5732b9486c9637248983b56c338be1a83a7e5e52af0713cdeba1a6014d5e90

Download Submit
C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe

Filesize
45KB

MD5
7a984e3a8ef99e429ceef1f1ddc144f4

SHA1
581dd32af3c53b1dc7b8a95aa2805ee0e8f44190

SHA256
4d8c876b969caf2449f169f89ec257f5e1412e23b609ab4f7c7ee72cd4b0de60

SHA512
b078b827e49cddfd743dd55802c0a48dc5056ccb172cb83a65e484a26c62fa30e1fa6860621752d4adbad3e5d234d759c817a0c0b3532531a99f50f05622bf6a

Download Submit
memory/1492-0-0x000000007431E000-0x000000007431F000-memory.dmp

Filesize
4KB

Download
memory/1492-1-0x0000000000A80000-0x0000000000A92000-memory.dmp

Filesize
72KB

Download
memory/1492-2-0x0000000005CA0000-0x0000000005D3C000-memory.dmp

Filesize
624KB

Download
memory/5528-16-0x00000000067B0000-0x0000000006D56000-memory.dmp

Filesize
5.6MB

Download
memory/5528-13-0x0000000074310000-0x0000000074AC1000-memory.dmp

Filesize
7.7MB

Download
memory/5528-17-0x0000000005CD0000-0x0000000005D36000-memory.dmp

Filesize
408KB

Download
memory/5528-18-0x00000000070E0000-0x0000000007156000-memory.dmp

Filesize
472KB

Download
memory/5528-19-0x0000000007160000-0x00000000071FC000-memory.dmp

Filesize
624KB

Download
memory/5528-20-0x0000000007080000-0x000000000709E000-memory.dmp

Filesize
120KB

Download
memory/5528-21-0x0000000007250000-0x0000000007290000-memory.dmp

Filesize
256KB

Download
memory/5528-22-0x00000000070B0000-0x00000000070BA000-memory.dmp

Filesize
40KB

Download
memory/5528-23-0x0000000007330000-0x0000000007394000-memory.dmp

Filesize
400KB

Download
memory/5528-26-0x0000000074310000-0x0000000074AC1000-memory.dmp

Filesize
7.7MB

Download
memory/5528-12-0x0000000074310000-0x0000000074AC1000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

DNS Request

DNS Response

DNS Request

DNS Response

DNS Request

DNS Request

DNS Response

DNS Request

DNS Response

DNS Request

DNS Response

DNS Request

DNS Request

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

We care about your privacy.