isrstealer | 011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7

General

Target

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
Size

737KB
MD5

8ea5e38acebe9b835f9b330faa8d6560
SHA1

d3473c0c7fd2b8d85104f0d6b5560cd8487177af
SHA256

011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7
SHA512

cd0fab7d46856e7504a9f5dc1528177a2bc79e26ad0f12ecb9e860f524c4cc2ef40f5ac8d28d2f50169242f7fa8ad2a12fe090950c835906ce4976ff6b363e58
SSDEEP

6144:SgxilHZyojpSVOfkNvR/XwSFXHw5sKxGhjuZxerwfJcWVPwt+Verd1cIJYvvmW:6lYkCRv5FX8sKxGhyyk6TcIJYvvmW

Score

10^/10

isrstealer discovery 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
behavioral2/memory/2580-37-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2580-38-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2580-42-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2580-56-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2580-57-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

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-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe

Executes dropped EXE 4 IoCs

pid	Process
2072	app.exe
2580	app.exe
2828	app.exe
3400	app.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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Application = "C:\\Users\\Admin\\AppData\\Roaming\\app.exe"	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2072 set thread context of 2580	2072	app.exe	92
PID 2580 set thread context of 2828	2580	app.exe	93
PID 2580 set thread context of 3400	2580	app.exe	94

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2828-49-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2828-52-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2828-50-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2828-46-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3400-54-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3964	3400	WerFault.exe	94

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	app.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	app.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	app.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
2072	app.exe
2072	app.exe
2072	app.exe
2072	app.exe
2072	app.exe
2072	app.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
Token: SeDebugPrivilege	2072	app.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2580	app.exe

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
3400	app.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3372 wrote to memory of 2072	3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe	91
PID 3372 wrote to memory of 2072	3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe	91
PID 3372 wrote to memory of 2072	3372	011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe	91
PID 2072 wrote to memory of 2580	2072	app.exe	92
PID 2072 wrote to memory of 2580	2072	app.exe	92
PID 2072 wrote to memory of 2580	2072	app.exe	92
PID 2072 wrote to memory of 2580	2072	app.exe	92
PID 2072 wrote to memory of 2580	2072	app.exe	92
PID 2072 wrote to memory of 2580	2072	app.exe	92
PID 2072 wrote to memory of 2580	2072	app.exe	92
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 2828	2580	app.exe	93
PID 2580 wrote to memory of 3400	2580	app.exe	94
PID 2580 wrote to memory of 3400	2580	app.exe	94
PID 2580 wrote to memory of 3400	2580	app.exe	94
PID 2580 wrote to memory of 3400	2580	app.exe	94
PID 2580 wrote to memory of 3400	2580	app.exe	94
PID 2580 wrote to memory of 3400	2580	app.exe	94
PID 2580 wrote to memory of 3400	2580	app.exe	94
PID 2580 wrote to memory of 3400	2580	app.exe	94

C:\Users\Admin\AppData\Local\Temp\011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe
"C:\Users\Admin\AppData\Local\Temp\011c839ea6f5be8ca3e8c2088248f8301bbc614cdc8746c040033206b103c1e7N.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3372
- C:\Users\Admin\AppData\Roaming\app.exe
  "C:\Users\Admin\AppData\Roaming\app.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2072
- - C:\Users\Admin\AppData\Roaming\app.exe
    "C:\Users\Admin\AppData\Roaming\app.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2580
  - - C:\Users\Admin\AppData\Roaming\app.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\KCY0jFpCKD.ini"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:2828
  - - C:\Users\Admin\AppData\Roaming\app.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\XzX3EwrtaU.ini"
      4⤵
      Executes dropped EXE
      Suspicious use of UnmapMainImage
      PID:3400
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3400 -s 12
        5⤵
        Program crash
        
        PID:3964

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 3400 -ip 3400
1⤵
PID:2080

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

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

Query Registry

1

T1012

System Information Discovery

2

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\KCY0jFpCKD.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

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

Filesize
746KB

MD5
edc1128ee54373c07de027040d68f004

SHA1
0f3941f664c97dda42107377b9de6029aed4b5ae

SHA256
72558ea9267f5de1431f4ed565f11d2f1b03d19f04777148d81cc4ff404ebc26

SHA512
89585199fe904e9a32049e2bffc47c611f6e18d8682f10292f308f9b5a1c857690de549f2ab530409c0daf8822bcac0c227e37422b93d3dcf43c729d8ae19241

Download Submit
memory/2072-31-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/2072-43-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/2072-35-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/2072-32-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/2072-33-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/2072-34-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/2580-56-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2580-42-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2580-38-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2580-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2580-37-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2828-49-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2828-52-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2828-50-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2828-46-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3372-30-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/3372-8-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/3372-7-0x0000000075282000-0x0000000075283000-memory.dmp

Filesize
4KB

Download
memory/3372-6-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/3372-0-0x0000000075282000-0x0000000075283000-memory.dmp

Filesize
4KB

Download
memory/3372-5-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/3372-2-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/3372-1-0x0000000075280000-0x0000000075831000-memory.dmp

Filesize
5.7MB

Download
memory/3400-54-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads