isrstealer | e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0

General

Target

e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
Size

670KB
MD5

5aa5d008136ee1d8ff62ed43d542347e
SHA1

bed4c146c4ad8000ce9b7d3ebac027cf98190384
SHA256

e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0
SHA512

f2e45c7d27bb72afc0dde33b6837c0ed842342e93e3894db0d665c97676346f5cd2c7e277bbe14b6279635cfca49de550ee6a43dfb5abcde7f2cacd8fcde727b
SSDEEP

12288:DU5AxENsBnveIebg0zOOeE32U/0XjjWY0nPVSr1xAFbao:g5cvEbNyOeETEjKYEPVSZK5

Score

10^/10

isrstealer collection persistence spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 5 IoCs

resource	yara_rule
behavioral1/memory/108-60-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/108-62-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/108-63-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/108-74-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/108-85-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "\"C:\\Users\\Admin\\AppData\\Roaming\\4SiwoU1Y1RW528k2\\bvd4Xhtqp07d.exe\",explorer.exe"	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1568-81-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1568-82-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1568-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral1/memory/1568-81-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1568-82-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1568-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2032-68-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2032-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2032-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2032-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1568-76-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1568-80-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1568-81-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1568-82-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2032-83-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1568-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1020 set thread context of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 108 set thread context of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 set thread context of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 1020 wrote to memory of 108	1020	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	27
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 2032	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	28
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29
PID 108 wrote to memory of 1568	108	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	29

C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
"C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe"
1⤵
- Modifies WinLogon for persistence
- Drops file in Drivers directory
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1020
- C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
  "C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:108
- - C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Jy0GASiv5A.ini"
    3⤵
    PID:2032
- - C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tivCtlvzNw.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1568

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/108-74-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/108-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/108-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/108-60-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/108-62-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/108-85-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1020-55-0x0000000074460000-0x0000000074A0B000-memory.dmp

Filesize
5.7MB

Download
memory/1020-56-0x0000000074460000-0x0000000074A0B000-memory.dmp

Filesize
5.7MB

Download
memory/1020-54-0x00000000762D1000-0x00000000762D3000-memory.dmp

Filesize
8KB

Download
memory/1568-76-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1568-80-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1568-81-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1568-82-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1568-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2032-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2032-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2032-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2032-83-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2032-68-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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