expiro | a0fda440bdb738ad31df32b4ec82ff588b545378a59131ea0b533c89dd11a0a4

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
03/01/2025, 03:17

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General

Target
JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
Size 898KB
Sample250103-dtalyaxlet
SHA256 a0fda440bdb738ad31df32b4ec82ff588b545378a59131ea0b533c89dd11a0a4
MD5 69e88f109ae5a31aa838b84c2bdbc870
SHA1 c2c684251a11e9e5a2bf07e9e19eb723a0141ddb
SHA512 e628c16ed18bd7d8d7130675744fb72c1deb0c497c380f84000151fc455e001bd31ddd5c3bb0521f1b0c34d107179072a41bf0a4b58b6ac3b17c9bf2c7b79e73
SSDEEP 24576:sRimzIbwuLL7Hs20f3aP3qPh/qYXAjIUMI:sRiT8uLnM20fqvqhqFjIUM
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

expiro backdoor discovery

Malware Config

Signatures

Expiro family
expiro
Expiro, m0yv
Expiro aka m0yv is a multi-functional backdoor written in C++.
backdoor expiro

Expiro payload 1 IoCs

backdoor

resource	yara_rule
behavioral2/memory/4680-3-0x0000000000400000-0x00000000006AE000-memory.dmp	family_expiro1

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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\Temp	AdobeARM.exe
File opened for modification	C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\Backup	AdobeARM.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 2 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	AdobeARM.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1568	AdobeARM.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4680 wrote to memory of 1568	4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe	84
PID 4680 wrote to memory of 1568	4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe	84
PID 4680 wrote to memory of 1568	4680	JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe	84
PID 1568 wrote to memory of 1784	1568	AdobeARM.exe	95
PID 1568 wrote to memory of 1784	1568	AdobeARM.exe	95
PID 1568 wrote to memory of 1784	1568	AdobeARM.exe	95

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_69e88f109ae5a31aa838b84c2bdbc870.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4680
- C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe
  "C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
  2⤵
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1568
- - C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Reader_sl.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Reader_sl.exe"
    3⤵
    PID:1784

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

AdobeARM.log

Path C:\Users\Admin\AppData\Local\Temp\AdobeARM.log
Size 358B
SHA256 579d224aaac9c533c6850703fac70adf86a7d07ab13e4aa2c2b500c60a31105a
MD5 4870600cd5d17d799925ec53e4bbc29a
SHA1 06b408ba96df89ddc2e881aa73a805544466fcba
SHA512 7511b0b62fe7315e509230e42264796a398f231e6e072550168691f1c3498d587b7eac483c388563984ae4a77145ea0a2fce0e8653da8c0ed8e1e4b26f580cc7
MD5 SHA1 SHA512

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ArmUI.ini

Path C:\Users\Admin\AppData\Local\Temp\ArmUI.ini
Size 251KB
SHA256 b4d4dcd9594d372d7c0c975d80ef5802c88502895ed4b8a26ca62e225f2f18b0
MD5 864c22fb9a1c0670edf01c6ed3e4fbe4
SHA1 bf636f8baed998a1eb4531af9e833e6d3d8df129
SHA512 ff23616ee67d51daa2640ae638f59a8d331930a29b98c2d1bd3b236d2f651f243f9bae38d58515714886cfbb13b9be721d490aad4f2d10cbba74d7701ab34e09
SSDEEP 3072:wT4DJAvCXkQqSmSgojgTaDuK1+4xKtaU/QX5Pm9vR549QHmYPCjTMNro0Jnxu4Fn:xvUzH5
MD5 SHA1 SHA512 SSDEEP

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TmpD2C1.tmp

Path C:\Users\Admin\AppData\Local\Temp\TmpD2C1.tmp
Size 3KB
SHA256 ff9b4cf04e3202f150f19c1711767361343935da7841c98b876c42fd2cabce9b
MD5 bbb796dd2b53f7fb7ce855bb39535e2f
SHA1 dfb022a179775c82893fe8c4f59df8f6d19bd2fd
SHA512 0d122f454fcbf4524c2756692f0f33dc98f5bd2426839c6f03cd5c5f4fd507a8a15cf489d7a7ceadd1b95cf31b506c04bf03d613a9ba7d76add92766b1dc5c2b
MD5 SHA1 SHA512

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TmpEE0B.tmp

Path C:\Users\Admin\AppData\Local\Temp\TmpEE0B.tmp
Size 3KB
SHA256 19fe53c801ad7edc635f61e9e28d07da31780c2480e6f37ecfc63fffe1b250fe
MD5 ec946860cff4f4a6d325a8de7d6254d2
SHA1 7c909f646d9b2d23c58f73ec2bb603cd59dc11fd
SHA512 38a98b18dbae063bc533a1ff25a3467a7de197651e07e77a1b22cf8ce251282ab31f61dcff5c51ef186cfd115dc506181d480eabffbe92af01dee6282cbee13e
MD5 SHA1 SHA512

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TmpEE3B.tmp

Path C:\Users\Admin\AppData\Local\Temp\TmpEE3B.tmp
Size 3KB
SHA256 dcc9d2695125406282ba990fec39403c44b12964acf51b5e0dc7f2080d714398
MD5 fc2430057cb1be74c788f10c2d4540c8
SHA1 cab67ee8d5191fbf9f25545825e06c1a822af2f2
SHA512 4e2b9709a9e3ca5173abb35816e5a0aebbf2a7aaf971d7f75f3ae66e4a812cbade103baa5016525f5ab83a60c18f8d3c278c90ff83e4afdae419f81673cb5aee
MD5 SHA1 SHA512

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TmpF05F.tmp

Path C:\Users\Admin\AppData\Local\Temp\TmpF05F.tmp
Size 3KB
SHA256 aabf92089e16fdb28706356dbc4efb5a81f5277946f2e67695b31676616ed2d2
MD5 a58599260c64cb41ed7d156db8ac13ef
SHA1 fb9396eb1270e9331456a646ebf1419fc283dc06
SHA512 6970cbc42e7ec64ccdb8e5633b7017b1e9ec0d4ad094869e221e9275b814b1442b84827996190159543bdb5e86df6885c45197c533d657db4660fca8ad761a71
MD5 SHA1 SHA512

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memory/4680-0-0x0000000000400000-0x00000000006AE000-memory.dmp

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memory/4680-1-0x0000000000412000-0x0000000000414000-memory.dmp

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memory/4680-3-0x0000000000400000-0x00000000006AE000-memory.dmp

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