isrstealer | 755f0b3c27d68bb4e6b05a92bd8c68c8d32b2adf6143739a07a116a3db7b066f

General

Target

JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe
Size

239KB
MD5

4345594553efe9baf55374ea56b8eb14
SHA1

9dd1e554b2df92c7aa5d7e46201dcca0d5b79d14
SHA256

755f0b3c27d68bb4e6b05a92bd8c68c8d32b2adf6143739a07a116a3db7b066f
SHA512

69ed00d785e53c2704f3c066177250e737379eeb1443c8e0e17a3189c8d11676e01596471bcd8d8a8a189c5f055ba30fdc321293d06be74439f0c3f7cf47da5b
SSDEEP

6144:dR6XZeWvkIejI92jcRCRHYl+jr92KcRCWS0P:qpJejI93CRw+jr9sCxS

Score

10^/10

isrstealer discovery 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 4 IoCs

resource	yara_rule
behavioral2/files/0x000b000000023bb2-38.dat	family_isrstealer
behavioral2/memory/2540-45-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/2540-48-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer
behavioral2/memory/2540-57-0x0000000000400000-0x0000000000414000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Checks computer location settings 2 TTPs 2 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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	pk.exe

Executes dropped EXE 4 IoCs

pid	Process
1988	[keygen].exe
4888	pk.exe
2456	240621656.exe
2540	pk.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4888 set thread context of 2540	4888	pk.exe	86

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000c000000023bab-5.dat	upx
behavioral2/memory/1988-9-0x0000000000400000-0x0000000000410000-memory.dmp	upx
behavioral2/memory/1988-26-0x0000000000400000-0x0000000000410000-memory.dmp	upx
behavioral2/memory/4888-30-0x0000000002810000-0x0000000002811000-memory.dmp	upx

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 5 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	240621656.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	[keygen].exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	pk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	pk.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
2540	pk.exe
2540	pk.exe
2456	240621656.exe
2456	240621656.exe
2540	pk.exe
2540	pk.exe
2456	240621656.exe
2456	240621656.exe
2540	pk.exe
2540	pk.exe
2456	240621656.exe
2456	240621656.exe
2540	pk.exe
2540	pk.exe
2456	240621656.exe
2456	240621656.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
4888	pk.exe
2540	pk.exe
2456	240621656.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4380 wrote to memory of 1988	4380	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe	82
PID 4380 wrote to memory of 1988	4380	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe	82
PID 4380 wrote to memory of 1988	4380	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe	82
PID 4380 wrote to memory of 4888	4380	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe	83
PID 4380 wrote to memory of 4888	4380	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe	83
PID 4380 wrote to memory of 4888	4380	JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe	83
PID 4888 wrote to memory of 2456	4888	pk.exe	84
PID 4888 wrote to memory of 2456	4888	pk.exe	84
PID 4888 wrote to memory of 2456	4888	pk.exe	84
PID 4888 wrote to memory of 2540	4888	pk.exe	86
PID 4888 wrote to memory of 2540	4888	pk.exe	86
PID 4888 wrote to memory of 2540	4888	pk.exe	86
PID 4888 wrote to memory of 2540	4888	pk.exe	86
PID 4888 wrote to memory of 2540	4888	pk.exe	86
PID 4888 wrote to memory of 2540	4888	pk.exe	86
PID 4888 wrote to memory of 2540	4888	pk.exe	86
PID 4888 wrote to memory of 2540	4888	pk.exe	86

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_4345594553efe9baf55374ea56b8eb14.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4380
- C:\Users\Admin\AppData\Local\Temp\[keygen].exe
  "C:\Users\Admin\AppData\Local\Temp\[keygen].exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:1988
- C:\Users\Admin\AppData\Local\Temp\pk.exe
  "C:\Users\Admin\AppData\Local\Temp\pk.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4888
- - C:\Users\Admin\AppData\Local\Temp\240621656.exe
    "C:\Users\Admin\AppData\Local\Temp\240621656.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:2456
- - C:\Users\Admin\AppData\Local\Temp\pk.exe
    "C:\Users\Admin\AppData\Local\Temp\pk.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:2540

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

2

T1552

Credentials In Files

2

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

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\240621656.exe

Filesize
76KB

MD5
729be215886e52acf1b9468eb72acfcf

SHA1
3cecedf384efbf2eeb78324cc9b7eeb2af8ab038

SHA256
808cf749a25dc9c1e6b8894776ab84157591cde8890589104827583a6d455a82

SHA512
2ca5a1c95af58c6e7f39996595918c2bf838bce3a2b7318bd27338f826d2a9f951da6f8b7ab33abf87517db23a3f3332398d8b60b4d2834611fecf8ed1c56935

Download Submit
C:\Users\Admin\AppData\Local\Temp\[keygen].exe

Filesize
25KB

MD5
c4d8b216912194fc830c0a212de4c4e7

SHA1
eb24098e3489e70cbc0f3c505e7d32825da72c95

SHA256
490c784af00478dc88eddb9743ae84c54b7227f2c0bf277f23502c60c945c3b3

SHA512
aa3c7fc5bfd6628d6769e4a4cb8437bd6646cb04010ca5b962bd9f1c6376b5d70c68325181e66ab5d0c92c51d24cbaa1f68fc15e9de9e58d1bb81eb99d5aa256

Download Submit
C:\Users\Admin\AppData\Local\Temp\pk.exe

Filesize
280KB

MD5
48721461e7452369c7dbc485b7ddb79b

SHA1
24ab65e1637d5fff51b3a329fedd2578a03bebcb

SHA256
87acc62eb7e794bfab31118aa32f7002cab51258d55d46e9c1dd57377849633a

SHA512
66d733620e907486a072db34fafbbdcb2989fdddc6af8a635979ad21c177ccca66eab2ba910bf1117cf631d29a5c9dfe647d4654a1f6ad81bf265e70065654f6

Download Submit
memory/1988-9-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/1988-26-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2540-57-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2540-48-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2540-45-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4888-30-0x0000000002810000-0x0000000002811000-memory.dmp

Filesize
4KB

Download
memory/4888-31-0x0000000002820000-0x0000000002821000-memory.dmp

Filesize
4KB

Download
memory/4888-29-0x0000000001FC0000-0x0000000001FC1000-memory.dmp

Filesize
4KB

Download
memory/4888-32-0x0000000002040000-0x0000000002041000-memory.dmp

Filesize
4KB

Download
memory/4888-33-0x0000000002050000-0x0000000002051000-memory.dmp

Filesize
4KB

Download
memory/4888-27-0x00000000027E0000-0x00000000027E1000-memory.dmp

Filesize
4KB

Download
memory/4888-44-0x0000000002AB0000-0x0000000002AB1000-memory.dmp

Filesize
4KB

Download
memory/4888-25-0x0000000002040000-0x0000000002041000-memory.dmp

Filesize
4KB

Download
memory/4888-23-0x0000000001FC0000-0x0000000001FC1000-memory.dmp

Filesize
4KB

Download
memory/4888-50-0x00000000027D0000-0x00000000027D1000-memory.dmp

Filesize
4KB

Download
memory/4888-22-0x0000000000520000-0x0000000000521000-memory.dmp

Filesize
4KB

Download

Analysis

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