90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c

General

Target

90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe
Size

50KB
MD5

9b3bd6359c8cdb7358aa80f3561840e7
SHA1

f78c42d9306864613806ab2f49a3aba31a9bb54a
SHA256

90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c
SHA512

ad2952ef408be5e97e4d71b252b1c7567d405b26d085888407f56d9365668746c8645db99b0108a24ed70d926e0e20bd201399610e2ed7d99d6027c81e8d983a
SSDEEP

768:hX0gWvCzuw6Uj9uGi45XOPxV5HNWnnnl000e999vddddIyyyOOtttb22221:6vCzuw6UD9Az5HNWnnn6222221

Score

8^/10

defense_evasion discovery evasion upx

Malware Config

Signatures

Sets file to hidden 1 TTPs 1 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1564.001

pid	Process
2804	attrib.exe

Deletes itself 1 IoCs

pid	Process
3008	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
2904	ayahost.exe

UPX packed file 7 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/1280-0-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral1/files/0x000c000000012284-4.dat	upx
behavioral1/memory/1280-6-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral1/memory/2904-7-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral1/memory/2904-13-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral1/memory/2904-16-0x0000000000400000-0x0000000000416000-memory.dmp	upx
behavioral1/memory/2904-19-0x0000000000400000-0x0000000000416000-memory.dmp	upx

Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Debug\ayahost.exe	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe
File opened for modification	C:\Windows\Debug\ayahost.exe	attrib.exe
File created	C:\Windows\Debug\ayahost.exe	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.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 4 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	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ayahost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	ayahost.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	ayahost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeIncBasePriorityPrivilege	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1280 wrote to memory of 2804	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	31
PID 1280 wrote to memory of 2804	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	31
PID 1280 wrote to memory of 2804	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	31
PID 1280 wrote to memory of 2804	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	31
PID 1280 wrote to memory of 3008	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	34
PID 1280 wrote to memory of 3008	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	34
PID 1280 wrote to memory of 3008	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	34
PID 1280 wrote to memory of 3008	1280	90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe	34

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2804	attrib.exe

C:\Users\Admin\AppData\Local\Temp\90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe
"C:\Users\Admin\AppData\Local\Temp\90bc2a5ebf63e317f6cb6381e93b53eff3121d5321b7fca980d647b08ae2b55c.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1280
- C:\Windows\SysWOW64\attrib.exe
  attrib +a +s +h +r C:\Windows\Debug\ayahost.exe
  2⤵
  - Sets file to hidden
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Views/modifies file attributes
  PID:2804
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\90BC2A~1.EXE > nul
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:3008

C:\Windows\Debug\ayahost.exe
C:\Windows\Debug\ayahost.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Checks processor information in registry
PID:2904

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

2

T1564

Hidden Files and Directories

2

T1564.001

Indicator Removal

1

T1070

File Deletion

1

T1070.004

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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Downloads

C:\Windows\debug\ayahost.exe

Filesize
51KB

MD5
f4e5552337c24839028394eb29996fe4

SHA1
ce05bdb56422925461f59b832d236acdda44ed66

SHA256
482e6a5b0ee2b9886f1535cc68736b9c617e9855522ebc97232e4082c8944348

SHA512
fa74d744c8fa4c5840ea6d573654a91b4cb67386fd2b6524c01894ad9aa212e2bfa49c37ec6f5ff69298b79b84a118d2dba42b8e15d99e138a593d7e5cd0346a

Download Submit
memory/1280-0-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1280-6-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2904-7-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2904-13-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2904-16-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/2904-19-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads