asyncrat | d14fecf7cb4dd641caa0a57a6d94cf22717e050a4dde0e80ce5b922cad23a4c6

General

Target
tmpe_0n881y.exe
Size 45KB
Sample260522-yr3vxset3l
SHA256 d14fecf7cb4dd641caa0a57a6d94cf22717e050a4dde0e80ce5b922cad23a4c6
MD5 b3c5268d4c9789dbabeb42b97919d98f
SHA1 e26581569355d8baa15ad2ed3551c8e082b3af68
SHA512 73142c45d648b6707b5632a45d6739b7b0139d067f2887e51e1ee0a5002eeb41fa35b3b7b3311e7596b0e21547337dcf5de4cb385738daa64584f0cf60977a20
SSDEEP 768:rukP5TkI7ZzWUTZ9Fmo2qTvZTohEaSPIxzjbqgX3iORmKFQMDZ3BDZ0x:rukP5TkUH2Q4Ea7x3b9XS7KFQcd0x
TLSH
T146232B003BE8C12BF2BE4FB89DF26145467AF5732603D58D1CC452DB5613BC69A42AFA
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

banglabazar-onlineshop.com:443
banglabazar-onlineshop.com:80
banglabazar-onlineshop.com:7797
banglabazar-onlineshop.com:8707
banglabazar-onlineshop.com:6620
www.banglabazar-onlineshop.com:443
www.banglabazar-onlineshop.com:80
www.banglabazar-onlineshop.com:7797
www.banglabazar-onlineshop.com:8707
www.banglabazar-onlineshop.com:6620
zbot.banglabazar-onlineshop.com:443
zbot.banglabazar-onlineshop.com:80
zbot.banglabazar-onlineshop.com:7797
zbot.banglabazar-onlineshop.com:8707
zbot.banglabazar-onlineshop.com:6620
cryptolocker.banglabazar-onlineshop.com:443
cryptolocker.banglabazar-onlineshop.com:80
cryptolocker.banglabazar-onlineshop.com:7797
cryptolocker.banglabazar-onlineshop.com:8707
cryptolocker.banglabazar-onlineshop.com:6620
sobig.banglabazar-onlineshop.com:443
sobig.banglabazar-onlineshop.com:80
sobig.banglabazar-onlineshop.com:7797
sobig.banglabazar-onlineshop.com:8707
sobig.banglabazar-onlineshop.com:6620
nanocore.banglabazar-onlineshop.com:443
nanocore.banglabazar-onlineshop.com:80
nanocore.banglabazar-onlineshop.com:7797
nanocore.banglabazar-onlineshop.com:8707
nanocore.banglabazar-onlineshop.com:6620

Mutex

WwL6T80HBizi

Attributes

delay
0
install
true
install_file
oaow4.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 2 IoCs

rat

resource	yara_rule
behavioral2/files/0x000500000001e6cb-8.dat	family_asyncrat
behavioral2/memory/860-10-0x0000000005720000-0x0000000005730000-memory.dmp	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	tmpe_0n881y.exe

Executes dropped EXE 2 IoCs

pid	Process
860	oaow4.exe
3480	oaow4.exe

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 7 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	cmd.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	oaow4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	oaow4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpe_0n881y.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4128	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
744	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe
3352	tmpe_0n881y.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3352	tmpe_0n881y.exe
Token: SeDebugPrivilege	860	oaow4.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3352 wrote to memory of 5084	3352	tmpe_0n881y.exe	89
PID 3352 wrote to memory of 2456	3352	tmpe_0n881y.exe	91
PID 5084 wrote to memory of 744	5084	cmd.exe	93
PID 2456 wrote to memory of 4128	2456	cmd.exe	94
PID 2456 wrote to memory of 3480	2456	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\tmpe_0n881y.exe
"C:\Users\Admin\AppData\Local\Temp\tmpe_0n881y.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3352
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "oaow4" /tr '"C:\Users\Admin\AppData\Roaming\oaow4.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5084
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "oaow4" /tr '"C:\Users\Admin\AppData\Roaming\oaow4.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:744
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFFFB.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2456
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4128
- - C:\Users\Admin\AppData\Roaming\oaow4.exe
    "C:\Users\Admin\AppData\Roaming\oaow4.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3480

C:\Users\Admin\AppData\Roaming\oaow4.exe
"C:\Users\Admin\AppData\Roaming\oaow4.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:860

Network

MITRE ATT&CK Enterprise v16

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

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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tmpFFFB.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpFFFB.tmp.bat
Size 149B
SHA256 ef376fbec310e0870d6e224e7bfbb846db7c2aba9b87cbcc51c34ed5f481da45
MD5 821d6121fffd9d01b87054e08971366e
SHA1 8957462d2cb52e86d9432638fc751182a1e6e8c0
SHA512 4f57965d65a4c203c19b4e8faf38f72393b033323a20ac8ae27e1c02aa4dd06b21a264284cc3bcf76dec9197b15ba3cf10e4e7026403f57d274e795d08754f27
TLSH
T116C02B4261C9FB0E2A05142702FADD8C91766C193F40BB00C744441D1680899F0D9342
MD5 SHA1 SHA512 TLSH

Submit Download

oaow4.exe

Path C:\Users\Admin\AppData\Roaming\oaow4.exe
Size 45KB
SHA256 d14fecf7cb4dd641caa0a57a6d94cf22717e050a4dde0e80ce5b922cad23a4c6
MD5 b3c5268d4c9789dbabeb42b97919d98f
SHA1 e26581569355d8baa15ad2ed3551c8e082b3af68
SHA512 73142c45d648b6707b5632a45d6739b7b0139d067f2887e51e1ee0a5002eeb41fa35b3b7b3311e7596b0e21547337dcf5de4cb385738daa64584f0cf60977a20
SSDEEP 768:rukP5TkI7ZzWUTZ9Fmo2qTvZTohEaSPIxzjbqgX3iORmKFQMDZ3BDZ0x:rukP5TkUH2Q4Ea7x3b9XS7KFQcd0x
TLSH
T146232B003BE8C12BF2BE4FB89DF26145467AF5732603D58D1CC452DB5613BC69A42AFA
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/860-10-0x0000000005720000-0x0000000005730000-memory.dmp

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memory/860-13-0x0000000005720000-0x0000000005730000-memory.dmp

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memory/3352-0-0x0000000000D00000-0x0000000000D12000-memory.dmp

Download

memory/3352-1-0x0000000005810000-0x0000000005820000-memory.dmp

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memory/3352-2-0x00000000056D0000-0x000000000576C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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